CVE-2026-77214: libexpat Heap Buffer Over-read in xmlparse.c via XML_ParseBuffer

Overview

Severity

High (CVSS 8.2)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Oct

Released

2026-10-09

Last Updated

2026-10-12

EPSS Score

0.55% (percentile: 44.4%)

Affected Products (2)

Other

• 21708-17084
• 21887-17084

Revision History

• 2026-10-09: Information published.
• 2026-10-10: Information published.
• 2026-10-11: Information published.
• 2026-10-12: Information published.