Out-of-bounds Read Affecting libevent-doc package, versions <0:2.1.13-1.el10_2


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.49% (41st percentile)

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  • Snyk IDSNYK-RHEL10-LIBEVENTDOC-19876837
  • published17 Sept 2026
  • disclosed20 Aug 2026

Introduced: 20 Aug 2026

CVE-2026-63383  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade RHEL:10 libevent-doc to version 0:2.1.13-1.el10_2 or higher.
This issue was patched in RHSA-2026:67909.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libevent-doc package and not the libevent-doc package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1