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CVE-2026-63383 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

No CVSS 3.x data is available for this CVE.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/libevent/libevent/security/advisories/GHSA-fj29-64w6-73h6	CISA-ADP
https://github.com/libevent/libevent/commit/91ed8745eebabdd27592a83d350338a8c4626321	[email protected]
https://github.com/libevent/libevent/commit/e1f9e21887c6b104e206a718385ba3ffc75180cb	[email protected]
https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable	[email protected]
https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha	[email protected]
https://github.com/libevent/libevent/security/advisories/GHSA-fj29-64w6-73h6	[email protected]

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-125	Out-of-bounds Read	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Aug 20, 2026	CVE Modified	CISA-ADP
Aug 20, 2026	New CVE Received	[email protected]