Vulnerability Description
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an incorrect integer conversion in event_tagging.c when evtag_unmarshal_header uses evtag_decode_int to decode an attacker-controlled uint32 payload length and returns it as a signed int. Values above INT_MAX become negative or truncated, and evtag_unmarshal_string can use the converted value in allocation sizing, producing a wrapped large allocation request and denial of service. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
Related Weaknesses (CWE)
References
- https://github.com/libevent/libevent/commit/109c16499282959d70f56ec3baf4c8b1e664
- https://github.com/libevent/libevent/commit/5e3c6ebe342b34c5a9bcf48e9a32ad6708b9
- 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-45c6-qx49-89m8
- https://github.com/libevent/libevent/security/advisories/GHSA-45c6-qx49-89m8
FAQ
What is CVE-2026-63384?
CVE-2026-63384 is a documented vulnerability. Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an incorrect integer conversion in event_tagging.c when evtag_unmarshal_header uses evtag_decode_int to decode ...
How severe is CVE-2026-63384?
CVSS scoring is not yet available for CVE-2026-63384. Check NVD for updates.
Is there a patch for CVE-2026-63384?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.