CVE-2026-6653 — CRITICAL (9.8)

Q: How severe is CVE-2026-6653?

CVE-2026-6653 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2026-6653?

Check the references section above for vendor advisories and patch information. Affected products include: Xmlsoft Libxml2.

Vulnerability Description

Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling.

CVSS Score

9.8

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Xmlsoft	Libxml2	>= 2.9.11, <= 2.11.0

Related Weaknesses (CWE)

CWE-611 CWE-416

References

https://bugs.launchpad.net/ubuntu/+source/libxml2/+bug/2141260ExploitIssue TrackingThird Party Advisory
https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1058ExploitIssue TrackingPatch

FAQ

What is CVE-2026-6653?

CVE-2026-6653 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper ent...

How severe is CVE-2026-6653?

CVE-2026-6653 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-6653?

Check the references section above for vendor advisories and patch information. Affected products include: Xmlsoft Libxml2.