{"id":"CVE-2026-124040","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-124040","summary":"CivetWeb through 1.16, when built with USE_HTTP2 and enable_http2 on, contains a use-after-free vulnerability in handle_http2() that retains freed :method and :path pointers. Unauthenticated…","details":"CivetWeb through 1.16, when built with USE_HTTP2 and enable_http2 on, contains a use-after-free vulnerability in handle_http2() that retains freed :method and :path pointers. Unauthenticated remote attackers can send a later HEADERS frame omitting these pseudo-headers to influence request method or path seen by access rules, or crash the server.","published":"2026-11-06T20:17:22.203","modified":"2026-11-06T20:17:22.347","cvss":{"score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://github.com/civetweb/civetweb"},{"type":"WEB","url":"https://github.com/civetweb/civetweb/blob/v1.16/src/http2.inl#L1574-L1581"},{"type":"WEB","url":"https://github.com/civetweb/civetweb/issues/1379"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/civetweb-through-1.16-http-2-use-after-free-via-stale-pseudo-header-state"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-11-06T20:17:22.347"}}