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[USN-8362-1] XZ Utils vulnerability

Posted on 02 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8362-1
June 02, 2026

xz-utils vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

XZ Utils could be made to crash or run programs as your login if it
received specially crafted input.

Software Description:
- xz-utils: XZ-format compression utilities

Details:

It was discovered that XZ Utils did not properly manage memory when
attempting to append data to a decoded index that contained no records.
An attacker could possibly use this issue to cause XZ Utils to crash,
resulting in a denial of service, or execute arbitrary code.

Update instructions:

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

Ubuntu 25.10
liblzma5 5.8.1-1ubuntu0.1
xz-utils 5.8.1-1ubuntu0.1
xzdec 5.8.1-1ubuntu0.1

Ubuntu 24.04 LTS
liblzma5 5.6.1+really5.4.5-1ubuntu0.3
xz-utils 5.6.1+really5.4.5-1ubuntu0.3
xzdec 5.6.1+really5.4.5-1ubuntu0.3

Ubuntu 22.04 LTS
liblzma5 5.2.5-2ubuntu1.1
xz-utils 5.2.5-2ubuntu1.1
xzdec 5.2.5-2ubuntu1.1

Ubuntu 20.04 LTS
liblzma5 5.2.4-1ubuntu1.1+esm1
Available with Ubuntu Pro
xz-utils 5.2.4-1ubuntu1.1+esm1
Available with Ubuntu Pro
xzdec 5.2.4-1ubuntu1.1+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
liblzma5 5.2.2-1.3ubuntu0.1+esm1
Available with Ubuntu Pro
xz-utils 5.2.2-1.3ubuntu0.1+esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
liblzma5 5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2
Available with Ubuntu Pro
xz-utils 5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2
Available with Ubuntu Pro
xzdec 5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2
Available with Ubuntu Pro

Ubuntu 14.04 LTS
liblzma5 5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2
Available with Ubuntu Pro
xz-utils 5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2
Available with Ubuntu Pro
xzdec 5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8362-1
CVE-2026-34743

Package Information:
https://launchpad.net/ubuntu/+source/xz-utils/5.8.1-1ubuntu0.1
https://launchpad.net/ubuntu/+source/xz-utils/5.6.1+really5.4.5-1ubuntu0.3
https://launchpad.net/ubuntu/+source/xz-utils/5.2.5-2ubuntu1.1

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