CVE-2026-63387: Libevent: Off-by-one stack buffer overflow in dnsname_to_labels via crafted DNS server response

Overview

Severity

High (CVSS 7)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Aug

Released

2026-08-22

EPSS Score

0.35% (percentile: 28.2%)

Affected Products (1)

Other

• 21739-17084

Revision History

• 2026-08-22: Information published.