CVE-2026-6653

HIGH

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

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References

Scores

CVSS v4 7.0
EPSS 0.0029
EPSS Percentile 20.8%
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-416 CWE-611
Status published
Products (1)
GNOME/libxml2 2.9.11 - 2.11.0
Published Jun 22, 2026
Tracked Since Jun 22, 2026