PT-2026-51247 · Libexpat · Libexpat

Netliomax25-Code · Published 2026-06-21 · Updated 2026-06-21 · CVE-2026-56411

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 The xmlwf component contains an integer overflow in the endDoctypeDecl() function. This issue is triggered via NOTATION declarations, which are used in XML to define the format of non-XML data.

Recommendations Update to version 2.8.2 or later.

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2026-56411

Affected Products

Libexpat

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-56411 · Security Note
• https://github.com/libexpat/libexpat/pull/1263 · Note
• https://twitter.com/CVEnew/status/2068747016427991271 · Twitter Post