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[USN-8956-1] Brotli vulnerability

Posted on 26 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8956-1
October 26, 2026

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

- Ubuntu 26.10
- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 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:

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 26.10
brotli 1.2.0-4ubuntu0.1
libbrotli1 1.2.0-4ubuntu0.1
python3-brotli 1.2.0-4ubuntu0.1

Ubuntu 26.04 LTS
brotli 1.2.0-3ubuntu0.1
libbrotli1 1.2.0-3ubuntu0.1
python3-brotli 1.2.0-3ubuntu0.1

Ubuntu 24.04 LTS
brotli 1.1.0-2ubuntu0.1
libbrotli1 1.1.0-2ubuntu0.1
python3-brotli 1.1.0-2ubuntu0.1

Ubuntu 22.04 LTS
brotli 1.0.9-2ubuntu0.1
libbrotli1 1.0.9-2ubuntu0.1
python3-brotli 1.0.9-2ubuntu0.1

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

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

Package Information:
https://launchpad.net/ubuntu/+source/brotli/1.2.0-4ubuntu0.1
https://launchpad.net/ubuntu/+source/brotli/1.2.0-3ubuntu0.1
https://launchpad.net/ubuntu/+source/brotli/1.1.0-2ubuntu0.1
https://launchpad.net/ubuntu/+source/brotli/1.0.9-2ubuntu0.1

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