CVE-2026-56411 — MEDIUM (6.9)

Q: What is CVE-2026-56411?

CVE-2026-56411 is a vulnerability with a CVSS score of 6.9 (MEDIUM). xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION declarations.

Q: How severe is CVE-2026-56411?

CVE-2026-56411 has been rated MEDIUM with a CVSS base score of 6.9/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-56411?

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 in endDoctypeDecl via NOTATION declarations.

CVSS Score

6.9

MEDIUM

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

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

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/1263PatchIssue Tracking

FAQ

What is CVE-2026-56411?

CVE-2026-56411 is a vulnerability with a CVSS score of 6.9 (MEDIUM). xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION declarations.

How severe is CVE-2026-56411?

CVE-2026-56411 has been rated MEDIUM with a CVSS base score of 6.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-56411?

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