PT-2026-51240 · Libexpat · Libexpat

Published 2026-06-21 · Updated 2026-06-21 · CVE-2026-56404

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 exists in the addBinding() function. An integer overflow occurs when an arithmetic operation attempts to create a numeric value that is outside of the range that can be represented with a given number of bits.

Recommendations Update to version 2.8.2 or later. As a temporary workaround, consider restricting the use of the addBinding() function until the update is applied.

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2026-56404

Affected Products

Libexpat

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-56404 · Security Note
• https://github.com/libexpat/libexpat/pull/1249 · Note
• https://twitter.com/CVEnew/status/2068747027140239637 · Twitter Post