CRITICAL 9.2 NVD
CVE-2026-124040
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 :
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.
References
- https://github.com/civetweb/civetweb
- https://github.com/civetweb/civetweb/blob/v1.16/src/http2.inl#L1574-L1581
- https://github.com/civetweb/civetweb/issues/1379
- https://www.vulncheck.com/advisories/civetweb-through-1.16-http-2-use-after-free-via-stale
This critical severity vulnerability with a CVSS score of 9.2 was published on 2026-11-06 via NVD.
Risk Timeline
CVE Disclosed2026-11-06 · 0 days ago
Remediation Resources
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