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Ubuntu 24.04 22.04 libxml2 Critical Denial of Service Vuln USN-8456-1

ubuntu
Calendar Grey June 24, 2026
Dist Ubuntu Esm H88
libxml2 has a critical flaw causing possible crashes and remote code execution. Update Ubuntu systems immediately.
libxml2 could be made to crash or run programs if it received specially crafted input.

Summary

libxml2 could be made to crash or run programs if it received specially

crafted input.

Software Description:

- libxml2: GNOME XML library

Details:

Geoffrey Humphreys discovered that libxml2 had a use after free when

parsing the internal subset of a DTD. A remote attacker could possibly use

this issue to cause a denial of service or possibly execute arbitrary code.

Topics%20covered

Topics Covered

security advisory denial of service update critical Ubuntu libxml2

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
  libxml2                         2.9.14+dfsg-1.3ubuntu3.8
  libxml2-dev                     2.9.14+dfsg-1.3ubuntu3.8
  libxml2-utils                   2.9.14+dfsg-1.3ubuntu3.8
  python3-libxml2                 2.9.14+dfsg-1.3ubuntu3.8

Ubuntu 22.04 LTS
  libxml2                         2.9.13+dfsg-1ubuntu0.12
  libxml2-dev                     2.9.13+dfsg-1ubuntu0.12
  libxml2-utils                   2.9.13+dfsg-1ubuntu0.12
  python3-libxml2                 2.9.13+dfsg-1ubuntu0.12

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8456-1

CVE-2026-6653

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8456-1

Topics%20covered

Topics Covered

security advisory denial of service update critical Ubuntu libxml2

Package Information

https://launchpad.net/ubuntu/+source/libxml2/2.9.14+dfsg-1.3ubuntu3.8
https://launchpad.net/ubuntu/+source/libxml2/2.9.13+dfsg-1ubuntu0.12

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