Medium 5.7Published Aug 20, 2026

CVE-2026-63380Libevent: Null Pointer Dereference in `evws_new_session`

Updated under an hour ago (2026-10-19 09:50 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.7 MEDIUM (v4.0, CNA)CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-416, CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Aug 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

libevent libevent libevent:libevent (from the name)	before 2.2.2-alpha	CNA record

References

https://github.com/libevent/libevent/security/advisories/GHSA-3rpf-frgx-xq34x-refsource-confirm
https://github.com/libevent/libevent/commit/825c18bd99f556b59d61200523237f264d5cc734x-refsource-misc
https://github.com/libevent/libevent/releases/tag/release-2.2.2-alphax-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.