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/E:U

Exploit Status

Not Exploited

Patch Tuesday

2026-Aug

Released

2026-08-22

Last Updated

2026-08-25

EPSS Score

0.42% (percentile: 33.7%)

Affected Products (5)

Other

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

Revision History

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