CVE-2026-72522: libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.

Overview

Severity

Medium (CVSS 6.2)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Aug

Released

2026-08-11

EPSS Score

0.15% (percentile: 5.0%)

Affected Products (1)

Other

• 21698-17084

Revision History

• 2026-08-11: Information published.