CVE-2026-124040

8.1 HIGHpublic exploit available

Published 2026-11-06 · Updated 2026-11-11

AI analysis for this CVE has not been generated yet. Raw NVD data is shown below.

NVD 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.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-416

Public exploit & PoC 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

All 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-pseudo-header-state

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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