Search criteria

1 vulnerability found for BCPIX-LTS by Legion of the Bouncy Castle Inc.

CVE-2026-5588 (GCVE-0-2026-5588)

Vulnerability from cvelistv5 – Published: 2026-04-15 09:06 – Updated: 2026-06-30 12:11
VLAI?
Title
PKIX draft CompositeVerifier accepts empty signature sequence as valid.
Summary
Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules), Legion of the Bouncy Castle Inc. BCPKIX-FIPS bcpkix on All (pkix modules), Legion of the Bouncy Castle Inc. BCPIX-LTS bcpkix on All (pkix modules). This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java, JcaContentVerfierProviderBuilder.Java. This issue affects BC-JAVA: from 1.67 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84; BCPKIX-FIPS: from 2.0.6 before 2.0.11, from 2.1.7 before 2.1.11; BCPIX-LTS: from 2.73.7 before 2.73.11.
CWE
  • CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
Assigner
Impacted products
Vendor Product Version
Legion of the Bouncy Castle Inc. BC-JAVA Affected: 1.67 , < 1.80.2 (maven)
Affected: 1.81 , < 1.81.1 (maven)
Affected: 1.82 , < 1.84 (maven)
Create a notification for this product.
    Legion of the Bouncy Castle Inc. BCPKIX-FIPS Affected: 2.0.6 , < 2.0.11 (maven)
Affected: 2.1.7 , < 2.1.11 (maven)
Create a notification for this product.
    Legion of the Bouncy Castle Inc. BCPIX-LTS Affected: 2.73.7 , < 2.73.11 (maven)
Create a notification for this product.
Credits
Nicholas Carlini using Claude, Anthropic
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-5588",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-15T19:35:32.235455Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-15T19:35:40.662Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "affected": [
          {
            "cpes": [
              "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat JBoss EAP 8.1 for RHEL 8",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat JBoss EAP 8.1 for RHEL 9",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:amq_broker:7.12"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat AMQ Broker 7.12.7",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:amq_broker:7.13"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat AMQ Broker 7.13.5",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:apache_camel_quarkus:3.27"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Build of Apache Camel 4.14 for Quarkus 3.27",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat JBoss Enterprise Application Platform 8.1",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_devspaces:3.28::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Dev Spaces 3.28",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:apache_camel_spring_boot:4.18"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:quarkus:3.20::el8"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat build of Quarkus 3.20.6.SP1",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:quarkus:3.27::el8"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat build of Quarkus 3.27.3.SP1",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:ocp_tools"
            ],
            "defaultStatus": "affected",
            "product": "OpenShift Developer Tools and Services",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:camel_quarkus:3"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat build of Apache Camel 4 for Quarkus 3",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:apicurio_registry:3"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat build of Apicurio Registry 3",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:debezium:3"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat build of Debezium 3",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:8"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux 8",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:jboss_fuse:7"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Fuse 7",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:jboss_enterprise_application_platform:7"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat JBoss Enterprise Application Platform 7",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_ai"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift AI (RHOAI)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:jboss_enterprise_bpms_platform:7"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Process Automation 7",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:red_hat_single_sign_on:7"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Single Sign-On 7",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:cryostat:4"
            ],
            "defaultStatus": "unaffected",
            "product": "Cryostat 4",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:amq_broker:7"
            ],
            "defaultStatus": "unaffected",
            "product": "Red Hat AMQ Broker 7",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:jboss_data_grid:8"
            ],
            "defaultStatus": "unaffected",
            "product": "Red Hat Data Grid 8",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:9"
            ],
            "defaultStatus": "unaffected",
            "product": "Red Hat Enterprise Linux 9",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:jbosseapxp"
            ],
            "defaultStatus": "unaffected",
            "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:satellite:6"
            ],
            "defaultStatus": "unaffected",
            "product": "Red Hat Satellite 6",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:amq_streams:2"
            ],
            "defaultStatus": "unaffected",
            "product": "streams for Apache Kafka 2",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:amq_streams:3"
            ],
            "defaultStatus": "unaffected",
            "product": "streams for Apache Kafka 3",
            "vendor": "Red Hat"
          }
        ],
        "datePublic": "2026-04-15T09:06:15.617Z",
        "descriptions": [
          {
            "lang": "en",
            "value": "A flaw was found in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix. The PKIX draft `CompositeVerifier` implementation improperly accepts an empty signature sequence as a valid cryptographic signature. This issue allows a remote attacker to bypass signature verification mechanisms, potentially compromising the authenticity and integrity of data."
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "namespace": "https://access.redhat.com/security/updates/classification/",
                "value": "Important"
              },
              "type": "Red Hat severity rating"
            }
          },
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
              "version": "3.1"
            },
            "format": "CVSS"
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-347",
                "description": "Improper Verification of Cryptographic Signature",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-30T12:11:15.811Z",
          "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
          "shortName": "redhat-SADP"
        },
        "references": [
          {
            "tags": [
              "vdb-entry",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/security/cve/CVE-2026-5588"
          },
          {
            "name": "RHBZ#2458634",
            "tags": [
              "issue-tracking",
              "x_refsource_REDHAT"
            ],
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458634"
          },
          {
            "tags": [
              "x_sadp-csaf-vex"
            ],
            "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5588.json"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:18054"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:18055"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:14276"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:14272"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:13631"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:18059"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:21772"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:17668"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:11720"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:11721"
          }
        ],
        "solutions": [
          {
            "lang": "en",
            "value": "RHSA-2026:18054: Red Hat JBoss EAP 8.1 for RHEL 8"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:18055: Red Hat JBoss EAP 8.1 for RHEL 9"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:14276: Red Hat AMQ Broker 7.12.7"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:14272: Red Hat AMQ Broker 7.13.5"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:13631: Red Hat Build of Apache Camel 4.14 for Quarkus 3.27"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:18059: Red Hat JBoss Enterprise Application Platform 8.1"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:21772: Red Hat OpenShift Dev Spaces 3.28"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:17668: Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:11720: Red Hat build of Quarkus 3.20.6.SP1"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:11721: Red Hat build of Quarkus 3.27.3.SP1"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-04-15T10:00:59.672Z",
            "value": "Reported to Red Hat."
          },
          {
            "lang": "en",
            "time": "2026-04-15T09:06:15.617Z",
            "value": "Made public."
          }
        ],
        "title": "bouncycastle: BC-JAVA: PKIX draft CompositeVerifier accepts empty signature sequence as valid",
        "workarounds": [
          {
            "lang": "en",
            "value": "To mitigate this flaw, check that the signature sequence is not empty before passing any data to the CompositeVerifier for cryptographic validation. If the sequence is empty or null, explicitly reject the payload before it is processed."
          }
        ],
        "x_adpType": "supplier",
        "x_generator": {
          "engine": "sadp-cli 1.0.0"
        }
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java/",
          "defaultStatus": "unaffected",
          "modules": [
            "pkix"
          ],
          "packageName": "bcpkix",
          "platforms": [
            "all"
          ],
          "product": "BC-JAVA",
          "programFiles": [
            "JcaContentVerifierProviderBuilder.java"
          ],
          "repo": "https://github.com/bcgit/bc-java",
          "vendor": "Legion of the Bouncy Castle Inc.",
          "versions": [
            {
              "lessThan": "1.80.2",
              "status": "affected",
              "version": "1.67",
              "versionType": "maven"
            },
            {
              "lessThan": "1.81.1",
              "status": "affected",
              "version": "1.81",
              "versionType": "maven"
            },
            {
              "lessThan": "1.84",
              "status": "affected",
              "version": "1.82",
              "versionType": "maven"
            }
          ]
        },
        {
          "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java-fips/",
          "defaultStatus": "unaffected",
          "modules": [
            "pkix"
          ],
          "packageName": "bcpkix",
          "platforms": [
            "All"
          ],
          "product": "BCPKIX-FIPS",
          "programFiles": [
            "JcaContentVerifierProviderBuilder.java"
          ],
          "repo": "https://repo1.maven.org/maven2/org/bouncycastle/bcpkix-fips/",
          "vendor": "Legion of the Bouncy Castle Inc.",
          "versions": [
            {
              "lessThan": "2.0.11",
              "status": "affected",
              "version": "2.0.6",
              "versionType": "maven"
            },
            {
              "lessThan": "2.1.11",
              "status": "affected",
              "version": "2.1.7",
              "versionType": "maven"
            }
          ]
        },
        {
          "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java-lts/",
          "defaultStatus": "unaffected",
          "modules": [
            "pkix"
          ],
          "packageName": "bcpkix",
          "platforms": [
            "All"
          ],
          "product": "BCPIX-LTS",
          "programFiles": [
            "JcaContentVerfierProviderBuilder.java"
          ],
          "repo": "https://repo1.maven.org/maven2/org/bouncycastle/bcpkix-lts8on/",
          "vendor": "Legion of the Bouncy Castle Inc.",
          "versions": [
            {
              "lessThan": "2.73.11",
              "status": "affected",
              "version": "2.73.7",
              "versionType": "maven"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Nicholas Carlini using Claude, Anthropic"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules), Legion of the Bouncy Castle Inc. BCPKIX-FIPS bcpkix on All (pkix modules), Legion of the Bouncy Castle Inc. BCPIX-LTS bcpkix on All (pkix modules).\u003cp\u003e This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java, JcaContentVerfierProviderBuilder.Java.\u003c/p\u003e\u003cp\u003eThis issue affects BC-JAVA: from 1.67 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84; BCPKIX-FIPS: from 2.0.6 before 2.0.11, from 2.1.7 before 2.1.11; BCPIX-LTS: from 2.73.7 before 2.73.11.\u003c/p\u003e"
            }
          ],
          "value": "Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules), Legion of the Bouncy Castle Inc. BCPKIX-FIPS bcpkix on All (pkix modules), Legion of the Bouncy Castle Inc. BCPIX-LTS bcpkix on All (pkix modules).\n\n This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java, JcaContentVerfierProviderBuilder.Java.\n\n\n\nThis issue affects BC-JAVA: from 1.67 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84; BCPKIX-FIPS: from 2.0.6 before 2.0.11, from 2.1.7 before 2.1.11; BCPIX-LTS: from 2.73.7 before 2.73.11."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "AMBER",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "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:Amber",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-327",
              "description": "CWE-327 Use of a Broken or Risky Cryptographic Algorithm",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-18T23:22:57.378Z",
        "orgId": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "shortName": "bcorg"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/bcgit/bc-java/commit/656bae0dbd9b1521f840521ff786e78749fe3057"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "PKIX draft CompositeVerifier accepts empty signature sequence as valid.",
      "x_generator": {
        "engine": "Vulnogram 1.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "91579145-5d7b-4cc5-b925-a0262ff19630",
    "assignerShortName": "bcorg",
    "cveId": "CVE-2026-5588",
    "datePublished": "2026-04-15T09:06:15.617Z",
    "dateReserved": "2026-04-04T23:50:59.336Z",
    "dateUpdated": "2026-06-30T12:11:15.811Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}