PT-2026-51243 · Libexpat · Libexpat

Netliomax25-Code · Published 2026-06-21 · Updated 2026-06-21 · CVE-2026-56407

Positive Technologies (AI Summary)

CVSS v3.1

6.9

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions libexpat versions prior to 2.8.2

Description An integer overflow occurs in the doProlog() function, specifically related to storeEntityValue and the entity textLen variable. An integer overflow is a condition where an arithmetic operation attempts to create a numeric value that is outside of the range that can be represented with a given number of digits.

Recommendations Update to version 2.8.2.

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2026-56407

Affected Products

Libexpat

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-56407 · Security Note
• https://github.com/libexpat/libexpat/pull/1262 · Note
• https://twitter.com/infoflowcloud/status/2068748549244821742 · Twitter Post
• https://twitter.com/CVEnew/status/2068747022866207074 · Twitter Post