CVE-2026-6653 | Use After Free in libxml2's xmlParseInternalSubset from GNOM… | CVSS 7.0 HIGH

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.

Metadata

CVE ID: CVE-2026-6653
State: PUBLISHED
Assigner: canonical
Reserved: 2026-04-20 06:37 UTC
Published: 2026-06-22 12:40 UTC
Last updated: 2026-06-22 15:51 UTC
Primary CWE: CWE-416
CWE-416 Use after free
Vendor / Product: GNOME / libxml2
Sources: cve.org · NVD

Severity & Metrics

7.0 HIGH CVSS 4.0

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
GNOME	libxml2	—	2.9.11 < 2.11.0

Weakness (CWE)

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

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.0	HIGH	4.0	cna	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

References (2)