{"id":"CVE-2026-124040","published":"2026-11-06T20:17:22.203","lastModified":"2026-11-11T05:19:35.630","description":"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.","cvssScore":8.1,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-416"],"vendors":[],"products":[],"references":[{"url":"https://github.com/civetweb/civetweb","tags":[]},{"url":"https://github.com/civetweb/civetweb/blob/v1.16/src/http2.inl#L1574-L1581","tags":[]},{"url":"https://github.com/civetweb/civetweb/issues/1379","tags":[]},{"url":"https://www.vulncheck.com/advisories/civetweb-through-1.16-http-2-use-after-free-via-stale-pseudo-header-state","tags":[]}],"exploitRefs":[{"url":"https://github.com/civetweb/civetweb","tags":[]},{"url":"https://github.com/civetweb/civetweb/blob/v1.16/src/http2.inl#L1574-L1581","tags":[]},{"url":"https://github.com/civetweb/civetweb/issues/1379","tags":[]}],"hasPoc":true,"ai":null}