CVE-2026-56409

MediumCVSS 6.5/10Last modified Nov 10, 2026

Description

xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L

Weakness enumeration

CWE-190

Affected software

Vendor	Product	Versions
libexpat project	libexpat	< 2.8.2
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)	>= V3.1.7, < *
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)	>= V3.1.7, < *
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)	>= V3.1.7, < *
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)	>= V3.1.7, < *
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)	>= V3.1.7, < *

References

https://github.com/libexpat/libexpat/pull/1259Issue Tracking, Patch
https://cert-portal.siemens.com/productcert/html/ssa-457936.html

Timeline

Published: Jun 21, 2026
Last modified: Nov 10, 2026
NVD status: Modified

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