PT-2026-51242 · Libexpat · Libexpat

Hartwork · Published 2026-06-21 · Updated 2026-06-21 · CVE-2026-56406

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 XML ParseBuffer() function because it lacks a specific check that is implemented in the XML Parse() function.

Recommendations Update to version 2.8.2 or later.

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2026-56406

Affected Products

Libexpat

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-56406 · Security Note
• https://github.com/libexpat/libexpat/pull/1255 · Note
• https://twitter.com/infoflowcloud/status/2068748567993274513 · Twitter Post
• https://twitter.com/CVEnew/status/2068747024397119596 · Twitter Post