CVE-2026-6653

libxml2: Use after free in xmlParseInternalSubset via improper entity resolution handling

State: Published
Severity: 7.0 High
Published: Jun 22, 2026
Updated: Jun 22, 2026
Reserved: Apr 20, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.0 High	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:P	canonical

Weaknesses

CWE-416 Use after free
CWE-611 Improper Restriction of XML External Entity Processing

Affected Products

Product	Versions
libxml2GNOME	2.9.11 to before 2.11.0Affected

References

https://bugs.launchpad.net/ubuntu/+source/libxml2/+bug/2141260issue-tracking
https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1058issue-tracking

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