{"id":"CVE-2026-93491","summary":"Io.netty/netty-codec-http: netty: denial of service via unbounded httpservercodec http/1.1 pipeline queue","details":"A flaw was found in Netty's HttpServerCodec. A remote, unauthenticated attacker can exploit this vulnerability by pipelining HTTP/1.1 requests on a single connection and withholding reads. This action causes the methodOverflowQueue to grow without limit, leading to unbounded heap memory consumption and a denial of service due to memory exhaustion.","modified":"2026-09-22T03:45:53.109343238Z","published":"2026-09-18T12:43:26.091Z","database_specific":{"cwe_ids":["CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93491.json","cna_assigner":"redhat"},"references":[{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"WEB","url":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html"},{"type":"WEB","url":"https://github.com/netty/netty/releases/tag/netty-4.1.138.Final"},{"type":"WEB","url":"https://github.com/netty/netty/releases/tag/netty-4.2.18.Final"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:69470"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-93491"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93491.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93491"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536891"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/netty/netty","events":[{"introduced":"0"},{"fixed":"26e68a2c3935e459b374891c87760f6d6c5e2550"},{"fixed":"2521f494432e27415a567d3a81a9eb907abf20b3"}],"database_specific":{"source":"REFERENCES"}}],"versions":["netty-clang-bin","netty-4.1.137.Final","netty-4.2.17.Final","netty-4.1.136.Final","netty-4.2.16.Final","netty-4.1.135.Final","netty-4.2.15.Final","netty-4.1.134.Final","netty-4.2.14.Final","netty-4.1.133.Final","netty-4.2.13.Final","netty-4.2.12.Final","netty-4.1.132.Final","netty-4.2.11.Final","netty-4.1.131.Final","netty-4.2.10.Final","netty-4.2.9.Final","netty-4.1.130.Final","netty-4.2.8.Final","netty-4.1.129.Final","netty-4.1.128.Final","netty-4.2.7.Final","netty-4.2.6.Final","netty-4.1.127.Final","netty-4.2.5.Final","netty-4.1.126.Final","netty-4.1.125.Final","netty-4.2.4.Final","netty-4.1.124.Final","netty-4.1.123.Final","netty-4.2.3.Final","netty-4.2.2.Final","netty-4.1.122.Final","netty-4.2.1.Final","netty-4.1.121.Final","netty-4.1.120.Final","netty-4.2.0.Final","netty-4.2.0.RC4","netty-4.1.119.Final","netty-4.2.0.RC3","netty-4.1.118.Final","netty-4.2.0.RC2","netty-4.1.117.Final","netty-4.1.116.Final","netty-4.2.0.RC1","netty-4.1.115.Final","netty-4.2.0.Beta1","netty-4.2.0.Alpha5","netty-4.1.114.Final","netty-4.2.0.Alpha4","netty-4.1.113.Final","netty-4.2.0.Alpha3","netty-4.1.112.Final","netty-4.2.0.Alpha2","netty-4.2.0.Alpha1","netty-4.1.111.Final","netty-4.1.110.Final","netty-4.1.109.Final","netty-4.1.108.Final","netty-4.1.107.Final","netty-4.1.106.Final","netty-4.1.105.Final","netty-4.1.104.Final","netty-4.1.103.Final","netty-4.1.102.Final","netty-4.1.101.Final","netty-4.1.100.Final","netty-4.1.99.Final","netty-4.1.98.Final","netty-4.1.97.Final","netty-4.1.96.Final","netty-4.1.95.Final","netty-4.1.94.Final","netty-4.1.93.Final","netty-4.1.92.Final","netty-4.1.91.Final","netty-4.1.90.Final","netty-4.1.89.Final","netty-4.1.88.Final","netty-4.1.87.Final","netty-4.1.86.Final","netty-4.1.85.Final","netty-4.1.84.Final","netty-4.1.83.Final","netty-4.1.82.Final","netty-4.1.81.Final","netty-4.1.80.Final","netty-4.1.79.Final","netty-4.1.78.Final","netty-4.1.77.Final","netty-4.1.76.Final","netty-4.1.75.Final","netty-4.1.74.Final","netty-4.1.73.Final","netty-4.1.72.Final","netty-4.1.71.Final","netty-4.1.70.Final","netty-4.1.69.Final","netty-4.1.68.Final","netty-4.1.67.Final","netty-4.1.66.Final","netty-4.1.65.Final","netty-4.1.64.Final","netty-4.1.63.Final","netty-4.1.62.Final","netty-4.1.61.Final","netty-4.1.60.Final","netty-4.1.59.Final","netty-4.1.58.Final","netty-4.1.57.Final","netty-4.1.56.Final","netty-4.1.55.Final","netty-4.1.54.Final","netty-4.1.53.Final","netty-4.1.52.Final","netty-4.1.51.Final","netty-4.1.50.Final","netty-4.1.49.Final","netty-4.1.48.Final","netty-4.1.47.Final","netty-4.1.46.Final","netty-4.1.45.Final","netty-4.1.44.Final","netty-4.1.43.Final","netty-4.1.42.Final","netty-4.1.41.Final","netty-4.1.40.Final","netty-4.1.39.Final","netty-4.1.38.Final","netty-4.1.37.Final","netty-4.1.36.Final","netty-4.1.35.Final","netty-4.1.34.Final","netty-4.1.33.Final","netty-4.1.32.Final","netty-4.1.31.Final","netty-4.1.30.Final","netty-4.1.29.Final","netty-4.1.28.Final","netty-4.1.27.Final","netty-4.1.26.Final","netty-4.1.25.Final","netty-4.1.24.Final","netty-4.1.23.Final","netty-4.1.22.Final","netty-4.1.21.Final","netty-4.1.20.Final","netty-4.1.19.Final","netty-4.1.18.Final","netty-4.1.17.Final","netty-4.1.16.Final","netty-4.1.15.Final","netty-4.1.14.Final","netty-4.1.13.Final","netty-4.1.12.Final","netty-4.1.11.Final","netty-4.1.10.Final","netty-4.1.9.Final","netty-4.1.8.Final","netty-4.1.7.Final","netty-4.1.6.Final","netty-4.1.5.Final","netty-4.1.4.Final","netty-4.1.3.Final","netty-4.1.2.Final","netty-4.1.1.Final","netty-4.1.0.Final","netty-4.1.0.CR7","netty-4.1.0.CR6","netty-4.1.0.CR5","netty-4.1.0.CR4","netty-4.1.0.CR3","netty-4.1.0.CR2","netty-4.1.0.CR1","netty-4.1.0.Beta8","netty-4.1.0.Beta7","netty-4.1.0.Beta6","netty-4.1.0.Beta5","netty-4.1.0.Beta4","netty-4.1.0.Beta3","netty-4.1.0.Beta2","netty-4.1.0.Beta1","netty-4.0.15.Final","netty-4.0.14.Final","netty-4.0.14.Beta1","netty-4.0.13.Final","netty-4.0.12.Final","netty-4.0.11.Final","netty-4.0.10.Final","netty-4.0.8.Final","netty-4.0.7.Final","netty-4.0.6.Final","netty-4.0.5.Final","netty-4.0.4.Final","netty-4.0.3.Final","netty-4.0.2.Final","netty-4.0.1.Final","netty-4.0.0.Final","netty-4.0.0.CR9","netty-4.0.0.CR8","netty-4.0.0.CR7","netty-4.0.0.CR5","netty-4.0.0.CR4","netty-4.0.0.CR3","netty-4.0.0.CR2","netty-4.0.0.CR1","netty-4.0.0.Beta3","netty-4.0.0.Beta2","netty-4.0.0.Beta1","netty-4.0.0.Alpha8","netty-4.0.0.Alpha7","netty-4.0.0.Alpha6","netty-4.0.0.Alpha5","netty-4.0.0.Alpha4","netty-4.0.0.Alpha3","netty-4.0.0.Alpha2","netty-4.0.0.Alpha1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93491.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}