Out-of-bounds Read The advisory has been revoked - it doesn't affect any version of package libevent (opens in a new tab)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.
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Test your applications- Snyk IDSNYK-RHEL10-LIBEVENT-19397627
- published28 Aug 2026
- disclosed20 Aug 2026
Introduced: 20 Aug 2026
CVE-2026-63383 (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 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.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2520654
- https://access.redhat.com/security/cve/CVE-2026-63383
- https://access.redhat.com/errata/RHSA-2026:60853
- https://access.redhat.com/errata/RHSA-2026:67909
- https://github.com/libevent/libevent/commit/91ed8745eebabdd27592a83d350338a8c4626321
- https://github.com/libevent/libevent/commit/e1f9e21887c6b104e206a718385ba3ffc75180cb
- 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