Dashboard / CVE-2026-63380

CVE-2026-63380

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 26/100
Published: 2026-08-20 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

No Interaction

CVSS Vector Breakdown

AV: Local
AC: High
PR: Low
UI: None
S: X
AT: Present
VC: None
VI: None
VA: High

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.

Weakness Classification (2)

References & Advisories (3)

Bug Bounty Relevance

26 / 100
✓ No user interaction

CVSS Score

5.7 / 10.0 v4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.14%
Raw Score 0.001400
Percentile 3.4%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00140
2026-10-28
0.00140

Intelligence Sources

nvd ref →

External Links