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MEDIUM · 6.9

CVE-2026-56407

libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen.

Vulnerability Description

libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen.

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-2026-56407?

CVE-2026-56407 is a vulnerability with a CVSS score of 6.9 (MEDIUM). libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen.

How severe is CVE-2026-56407?

CVE-2026-56407 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-2026-56407?

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