CVE-2026-56409 — MEDIUM (6.5)

Q: What is CVE-2026-56409?

CVE-2026-56409 is a vulnerability with a CVSS score of 6.5 (MEDIUM). xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.

Q: How severe is CVE-2026-56409?

CVE-2026-56409 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-56409?

Check the references section above for vendor advisories and patch information. Affected products include: Libexpat Project Libexpat.

Vulnerability Description

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

CVSS Score

6.5

MEDIUM

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

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

LOW

Affected Products

Vendor	Product	Versions
Libexpat Project	Libexpat	< 2.8.2

Related Weaknesses (CWE)

CWE-190

References

https://github.com/libexpat/libexpat/pull/1259PatchIssue Tracking

FAQ

What is CVE-2026-56409?

CVE-2026-56409 is a vulnerability with a CVSS score of 6.5 (MEDIUM). xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.

How severe is CVE-2026-56409?

CVE-2026-56409 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-56409?

Check the references section above for vendor advisories and patch information. Affected products include: Libexpat Project Libexpat.