CVE-2026-63388: Libevent: Heap out-of-bounds write in bufferevent_socket_set_conn_address_ reachable via AF_UNIX accept

Overview

Severity

High (CVSS 8.4)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Aug

Released

2026-08-22

Last Updated

2026-08-25

EPSS Score

0.14% (percentile: 3.0%)

Affected Products (6)

Other

• 21739-17084
• 21260-17084
• 21753-17084
• 21270-17084
• 21754-17084
• 21755-17084

Revision History

• 2026-08-22: Information published.
• 2026-08-25: Information published.