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MEDIUM · 6.9

CVE-2026-56406

libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse.

Vulnerability Description

libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse.

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

VendorProductVersions
Libexpat ProjectLibexpat< 2.8.2

Related Weaknesses (CWE)

CWE-190

References

FAQ

What is CVE-2026-56406?

CVE-2026-56406 is a vulnerability with a CVSS score of 6.9 (MEDIUM). libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse.

How severe is CVE-2026-56406?

CVE-2026-56406 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-2026-56406?

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