Vulnerability Description
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in event_tagging.c when decode_tag_internal requests at most five bytes from evbuffer_pullup but iterates using the full logical buffer length. A fragmented evbuffer containing a six-byte malformed tag can therefore advance past the pullup window and trigger an out-of-bounds read, which can crash a process that decodes attacker-controlled tagged RPC data. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
Related Weaknesses (CWE)
References
- https://github.com/libevent/libevent/commit/91ed8745eebabdd27592a83d350338a8c462
- https://github.com/libevent/libevent/commit/e1f9e21887c6b104e206a718385ba3ffc751
- https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable
- https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha
- https://github.com/libevent/libevent/security/advisories/GHSA-fj29-64w6-73h6
- https://github.com/libevent/libevent/security/advisories/GHSA-fj29-64w6-73h6
FAQ
What is CVE-2026-63383?
CVE-2026-63383 is a documented vulnerability. Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in event_tagging.c when decode_tag_internal requests at most five byte...
How severe is CVE-2026-63383?
CVSS scoring is not yet available for CVE-2026-63383. Check NVD for updates.
Is there a patch for CVE-2026-63383?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.