PT-2026-51245 · Libexpat · Libexpat

Netliomax25-Code · Published 2026-06-21 · Updated 2026-06-21 · CVE-2026-56409

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:L/AC:H/PR:N/UI:R/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 tool contains an integer overflow related to the output filename when the -d outputDir option is utilized. An integer overflow occurs when a mathematical operation results in a value that exceeds the maximum size of the integer type used to store it, potentially leading to memory corruption or crashes.

Recommendations Update to version 2.8.2 or later.

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2026-56409

Affected Products

Libexpat

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-56409 · Security Note
• https://github.com/libexpat/libexpat/pull/1259 · Note
• https://twitter.com/infoflowcloud/status/2068748531360301562 · Twitter Post
• https://twitter.com/CVEnew/status/2068747019200373111 · Twitter Post