{"id":"CVE-2026-42580","state":"PUBLISHED","title":"Netty: HTTP Request Smuggling due to incorrect chunk size parsing","description":"Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.","publishedAt":"2026-05-13T18:04:03.690Z","updatedAt":"2026-05-14T18:21:13.322Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["netty netty","io.netty netty-codec-http"],"affected":[{"vendor":"netty","product":"netty","versions":[{"version":">= 4.2.0.Alpha1, < 4.2.13.Final","status":"affected"},{"version":"< 4.1.133.Final","status":"affected"}]},{"vendor":"io.netty","product":"netty-codec-http","versions":[{"version":">= 4.2.0.Alpha1, < 4.2.13.Final","status":"affected"},{"version":"< 4.1.133.Final","status":"affected"}]}],"references":["https://github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723"],"weaknesses":["CWE-444","CWE-190"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/42xxx/CVE-2026-42580.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-42580","state":"PUBLISHED","datePublished":"2026-05-13T18:04:03.690Z","dateUpdated":"2026-05-14T18:21:13.322Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-28T17:26:12.085Z"},"containers":{"cna":{"title":"Netty: HTTP Request Smuggling due to incorrect chunk size parsing","descriptions":[{"lang":"en","value":"Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final."}],"affected":[{"vendor":"netty","product":"netty","versions":[{"version":">= 4.2.0.Alpha1, < 4.2.13.Final","status":"affected"},{"version":"< 4.1.133.Final","status":"affected"}]},{"vendor":"io.netty","product":"netty-codec-http","versions":[{"version":">= 4.2.0.Alpha1, < 4.2.13.Final","status":"affected"},{"version":"< 4.1.133.Final","status":"affected"}]}],"references":[{"url":"https://github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723","name":"https://github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-444","lang":"en","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-190","lang":"en","description":"CWE-190: Integer Overflow or Wraparound","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-13T18:04:03.690Z"},"source":{"advisory":"GHSA-m4cv-j2px-7723","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-14T18:21:08.229314Z","id":"CVE-2026-42580","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-14T18:21:13.322Z"}}]}}}