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[USN-8956-2] Brotli vulnerability

Posted on 30 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8956-2
October 27, 2026

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Brotli could be made to crash or run programs if it received specially
crafted input.

Software Description:
- brotli: lossless compression algorithm and format (command line utility)

Details:

USN-8956-1 fixed a vulnerability in Brotli. This update provides the
corresponding fixes for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and
Ubuntu 20.04 LTS.

Original advisory details:

It was discovered that Brotli incorrectly handled certain compressed
streams. A remote attacker could possibly use this issue to cause 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 20.04 LTS
brotli 1.0.7-6ubuntu0.1+esm1
Available with Ubuntu Pro
libbrotli1 1.0.7-6ubuntu0.1+esm1
Available with Ubuntu Pro
python3-brotli 1.0.7-6ubuntu0.1+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
brotli 1.0.3-1ubuntu1.3+esm1
Available with Ubuntu Pro
libbrotli1 1.0.3-1ubuntu1.3+esm1
Available with Ubuntu Pro
python-brotli 1.0.3-1ubuntu1.3+esm1
Available with Ubuntu Pro
python3-brotli 1.0.3-1ubuntu1.3+esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
brotli 1.0.3-1ubuntu1~16.04.2+esm1
Available with Ubuntu Pro
libbrotli1 1.0.3-1ubuntu1~16.04.2+esm1
Available with Ubuntu Pro
python-brotli 1.0.3-1ubuntu1~16.04.2+esm1
Available with Ubuntu Pro
python3-brotli 1.0.3-1ubuntu1~16.04.2+esm1
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8956-2
https://ubuntu.com/security/notices/USN-8956-1
CVE-2026-111497

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