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CVE-2026-63380 Details

Description

Libevent is an event notification library. Prior to 2.2.2-alpha, libevent can dereference invalid list pointers in ws.c when evws_new_session enters its error path after evhttp_start_ws_ succeeds but bufferevent_enable_locking_ fails. evws_connection_free sees a non-null http_server and unconditionally calls TAILQ_REMOVE even though the session was never inserted into http_server->ws_sessions. A local caller able to induce this allocation or locking failure can crash the process. This issue is fixed in version 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-3rpf-frgx-xq34	CISA-ADP
https://github.com/libevent/libevent/commit/825c18bd99f556b59d61200523237f264d5cc734	[email protected]
https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha	[email protected]
https://github.com/libevent/libevent/security/advisories/GHSA-3rpf-frgx-xq34	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-416	Use After Free	[email protected]
CWE-476	NULL Pointer Dereference	[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 25, 2026	CVE Modified	CISA-ADP
Aug 20, 2026	New CVE Received	[email protected]