CVE-2026-124040
Last modified
CVE-2026-124040 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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..
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.
Metrics
Weakness Enumeration
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-124040?
How severe is CVE-2026-124040?
How do I fix CVE-2026-124040?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-124028mistral.rs before 0.9.5 contains a delimiter injection vulne…4.2
- CVE-2026-124029Kopia through 0.23.1 contains a path traversal vulnerability…5.7
- CVE-2026-124030GPAC through 26.07.0 contains a type confusion vulnerability…5.5
- CVE-2026-124031GPAC through 26.07.0 contains a type confusion vulnerability…5.5
- CVE-2026-124039Gitleaks through 8.30.1 contains an incorrect permission ass…3.3
- CVE-2026-12404The NEX-Forms – Ultimate Forms Plugin for WordPress plugin f…5.3
- CVE-2026-12405A flaw was found in rubygem-foreman_remote_execution. A comm…8.8
- CVE-2026-124057A security flaw has been discovered in TOTOLINK CA300-PoE 6.…9.1
- CVE-2026-124058A weakness has been identified in TOTOLINK CA300-PoE 6.2c.88…9.1
- CVE-2026-124059A security vulnerability has been detected in TOTOLINK CA300…9.1
- CVE-2026-12406The User Frontend: AI Powered Frontend Posting, User Directo…5.3
- CVE-2026-124060A vulnerability was detected in TOTOLINK CA300-PoE 6.2c.884.…9.1
Are you affected by CVE-2026-124040?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST