CVE-2026-115506: libexpat through 2.9.0 Denial of Service via Billion Laughs Detection Delay

Overview

Severity

High (CVSS 7.5)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Oct

Released

2026-10-24

EPSS Score

0.35% (percentile: 27.5%)

Affected Products (1)

Other

• 21887-17084

Revision History

• 2026-10-24: Information published.