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[USN-8234-1] Mako vulnerability

Posted on 05 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8234-1
May 05, 2026

python-mako vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Mako could be made to expose sensitive information over the network.

Software Description:
- mako: fast and lightweight templating for the Python platform

Details:

It was discovered that Mako incorrectly handled URIs with double-slash
prefixes in TemplateLookup. A remote attacker could possibly use this issue
to obtain sensitive information.

Update instructions:

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

Ubuntu 26.04 LTS
python3-mako 1.3.10-3ubuntu0.1

Ubuntu 25.10
python3-mako 1.3.9-1ubuntu0.1

Ubuntu 24.04 LTS
python3-mako 1.3.2-1ubuntu0.1

Ubuntu 22.04 LTS
python3-mako 1.1.3+ds1-2ubuntu0.2

Ubuntu 20.04 LTS
python-mako 1.1.0+ds1-1ubuntu2.1+esm1
Available with Ubuntu Pro
python3-mako 1.1.0+ds1-1ubuntu2.1+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
python-mako 1.0.7+ds1-1ubuntu0.2+esm1
Available with Ubuntu Pro
python3-mako 1.0.7+ds1-1ubuntu0.2+esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
python-mako 1.0.3+ds1-1ubuntu1+esm2
Available with Ubuntu Pro
python3-mako 1.0.3+ds1-1ubuntu1+esm2
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8234-1
CVE-2026-41205

Package Information:
https://launchpad.net/ubuntu/+source/mako/1.3.10-3ubuntu0.1
https://launchpad.net/ubuntu/+source/mako/1.3.9-1ubuntu0.1
https://launchpad.net/ubuntu/+source/mako/1.3.2-1ubuntu0.1
https://launchpad.net/ubuntu/+source/mako/1.1.3+ds1-2ubuntu0.2

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