{"id":"DEBIAN-CVE-2026-124040","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.","modified":"2026-11-07T19:00:40.690356621Z","published":"2026-11-06T20:17:22.203Z","upstream":["CVE-2026-124040"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-124040"}],"affected":[{"package":{"name":"civetweb","ecosystem":"Debian:12","purl":"pkg:deb/debian/civetweb?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.15+dfsg-4","1.16+dfsg-1","1.16+dfsg-2","1.16+dfsg-3","1.16+dfsg-4","1.16+dfsg-5","1.16+dfsg-6"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-124040.json"}},{"package":{"name":"civetweb","ecosystem":"Debian:13","purl":"pkg:deb/debian/civetweb?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.16+dfsg-2","1.16+dfsg-2+deb13u1","1.16+dfsg-3","1.16+dfsg-4","1.16+dfsg-5","1.16+dfsg-6"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-124040.json"}},{"package":{"name":"civetweb","ecosystem":"Debian:14","purl":"pkg:deb/debian/civetweb?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.16+dfsg-2","1.16+dfsg-3","1.16+dfsg-4","1.16+dfsg-5","1.16+dfsg-6"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-124040.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}