🛡️ CVE-2026-6653 on Ubuntu — libxml2

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2026-6653 as tracked by Ubuntu, for the package libxml2. The fix is available in version 2.9.14+dfsg-1.3ubuntu3.8; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

UBUNTU-CVE-2026-6653 is recorded against 1 package.

  • libxml2 (fixed in 2.9.14+dfsg-1.3ubuntu3.8)

Timeline and source

Published on 22 June 2026 and last revised on 15 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
gitlab.gnome.org (Report)
bugs.launchpad.net (Report)
ubuntu.com (Advisory)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-06-22
Updated 2026-08-12
Modified 2026-07-15
Fix URL N/A

Affected Packages

Software From version Fixed in
libxml2 — 2.9.14+dfsg-1.3ubuntu3.8

Exploit Protection

Are you running libxml2?

UBUNTU-CVE-2026-6653 carries CVSS 9.8 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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