========================================================================== 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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