Integer Overflow or Wraparound The advisory has been revoked - it doesn't affect any version of package libevent (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-RHEL10-LIBEVENT-19394313
- published28 Aug 2026
- disclosed20 Aug 2026
Introduced: 20 Aug 2026
CVE-2026-63384 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libevent package and not the libevent package as distributed by RHEL.
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.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2520658
- https://access.redhat.com/security/cve/CVE-2026-63384
- https://access.redhat.com/errata/RHSA-2026:60853
- https://access.redhat.com/errata/RHSA-2026:67909
- https://github.com/libevent/libevent/commit/109c16499282959d70f56ec3baf4c8b1e6646bda
- https://github.com/libevent/libevent/commit/5e3c6ebe342b34c5a9bcf48e9a32ad6708b9c416
- 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