Name: CVE-2026-6653: Use After Free
Creator: Rapid7
Published: 2026-06-22T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-6653, CWE-416, CWE-611, CVSS 9.8, EPSS 0.00355

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 Details

CVSS 4.0 Base Score: 7 (HIGH)
CVSS 4.0 Vector: (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)
CVSS 3.1 Base Score: 9.8
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alma_linux	—	Upgrade python3-libxml2Upgrade libxml2Upgrade libxml2-devel	Oct 11, 2026	Aug 31, 2026
Amazon Linux Ami 2	—	Upgrade libxml2Upgrade libxml2-staticUpgrade libxml2-debuginfoUpgrade libxml2-develUpgrade libxml2-python	Jul 8, 2026	Jul 8, 2026
Amazon_linux_2023	—	Upgrade libxml2-staticUpgrade python3-libxml2Upgrade libxml2Upgrade libxml2-debuginfoUpgrade libxml2-debugsourceUpgrade python3-libxml2-debuginfoUpgrade libxml2-devel	Jul 8, 2026	Jun 22, 2026
Redhat_linux	—	Upgrade python3-libxml2-debuginfoUpgrade libxml2Upgrade libxml2-debugsourceUpgrade libxml2-debuginfoUpgrade python3-libxml2Upgrade libxml2-devel	Jul 17, 2026	Jun 22, 2026
Rocky_linux	—	Upgrade libxml2-debuginfoUpgrade libxml2-develUpgrade python3-libxml2Upgrade libxml2-debugsourceUpgrade libxml2Upgrade python3-libxml2-debuginfo	Sep 2, 2026	Aug 31, 2026
Ubuntu	—	Upgrade libxml2-devUpgrade python3-libxml2Upgrade libxml2Upgrade libxml2-utils	Jun 24, 2026	Jun 22, 2026

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CVSS Details

Covered by Rapid7

Prioritise with Active Threat Intelligence