FKIE_CVE-2026-42581
Vulnerability from fkie_nvd - Published: 2026-05-13 19:17 - Updated: 2026-06-30 03:19
Severity ?
5.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Summary
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.
References
{
"affected": [
{
"affectedData": [
{
"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"
}
]
}
],
"source": "security-advisories@github.com"
},
{
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{
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"vendor": "Red Hat"
},
{
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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},
{
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{
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},
{
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{
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"vendor": "Red Hat"
},
{
"cpes": [
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],
"defaultStatus": "unknown",
"product": "Red Hat AMQ Clients",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:camel_quarkus:3"
],
"defaultStatus": "unknown",
"product": "Red Hat build of Apache Camel 4 for Quarkus 3",
"vendor": "Red Hat"
},
{
"cpes": [
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],
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},
{
"cpes": [
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{
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{
"cpes": [
"cpe:/a:redhat:debezium:3"
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{
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"cpe:/a:redhat:build_keycloak:"
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{
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{
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},
{
"cpes": [
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],
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"vendor": "Red Hat"
},
{
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"cpe:/a:redhat:jboss_fuse:7"
],
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"product": "Red Hat Fuse 7",
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},
{
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"cpe:/a:redhat:jboss_enterprise_application_platform:7"
],
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"product": "Red Hat JBoss Enterprise Application Platform 7",
"vendor": "Red Hat"
},
{
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],
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"product": "Red Hat JBoss Enterprise Application Platform 8",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:jbosseapxp"
],
"defaultStatus": "unknown",
"product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openshift_ai"
],
"defaultStatus": "unknown",
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"vendor": "Red Hat"
},
{
"cpes": [
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},
{
"cpes": [
"cpe:/a:redhat:jboss_enterprise_bpms_platform:7"
],
"defaultStatus": "unknown",
"product": "Red Hat Process Automation 7",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:satellite:6"
],
"defaultStatus": "unknown",
"product": "Red Hat Satellite 6",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:red_hat_single_sign_on:7"
],
"defaultStatus": "unknown",
"product": "Red Hat Single Sign-On 7",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:amq_streams:3"
],
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}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
"matchCriteriaId": "DFE205A5-2C43-40C9-A2FF-CF6759B8D861",
"versionEndExcluding": "4.1.133",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
"matchCriteriaId": "D94A720F-9CED-4BE9-8C37-FD9E2FD28472",
"versionEndExcluding": "4.2.13",
"versionStartIncluding": "4.2.0",
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"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."
}
],
"id": "CVE-2026-42581",
"lastModified": "2026-06-30T03:19:40.327",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"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"
},
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"impactScore": 1.4,
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{
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"baseScore": 9.8,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"source": "nvd@nist.gov",
"type": "Primary"
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{
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{
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{
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-13T18:42:38.397208Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-05-13T19:17:23.627",
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}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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