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[USN-8685-1] bzip2 vulnerability

Posted on 31 August 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8685-1
August 27, 2026

bzip2 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- 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:

bzip2 could be made to crash if it processed a specially crafted archive.

Software Description:
- bzip2: high-quality block-sorting file compressor

Details:

It was discovered that bzip2 did not properly manage memory under certain
circumstances. An attacker could possibly use this issue to cause a crash,
resulting in a denial of service.

Update instructions:

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

Ubuntu 26.04 LTS
bzip2 1.0.8-6ubuntu0.1

Ubuntu 24.04 LTS
bzip2 1.0.8-5.1ubuntu0.1

Ubuntu 22.04 LTS
bzip2 1.0.8-5ubuntu0.1

Ubuntu 20.04 LTS
bzip2 1.0.8-2ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
bzip2 1.0.6-8.1ubuntu0.2+esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
bzip2 1.0.6-8ubuntu0.2+esm1
Available with Ubuntu Pro

Ubuntu 14.04 LTS
bzip2 1.0.6-5ubuntu0.1~esm3
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8685-1
CVE-2026-42250

Package Information:
https://launchpad.net/ubuntu/+source/bzip2/1.0.8-6ubuntu0.1
https://launchpad.net/ubuntu/+source/bzip2/1.0.8-5.1ubuntu0.1
https://launchpad.net/ubuntu/+source/bzip2/1.0.8-5ubuntu0.1

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