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Ubuntu Security Notice USN-5625-1
September 21, 2022

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

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM

Summary:

Mako could be made to denial of service if it received a
specially crafted regular expression.

Software Description:
- mako: documentation for the Mako Python library

Details:

It was discovered that Mako incorrectly handled certain regular expressions.
An attacker could possibly use this issue to cause a denial of service.

Update instructions:

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

Ubuntu 22.04 LTS:
  python3-mako                    1.1.3+ds1-2ubuntu0.1

Ubuntu 20.04 LTS:
  python-mako                     1.1.0+ds1-1ubuntu2.1
  python3-mako                    1.1.0+ds1-1ubuntu2.1

Ubuntu 18.04 LTS:
  python-mako                     1.0.7+ds1-1ubuntu0.2
  python3-mako                    1.0.7+ds1-1ubuntu0.2

Ubuntu 16.04 ESM:
  python-mako                     1.0.3+ds1-1ubuntu1+esm1
  python3-mako                    1.0.3+ds1-1ubuntu1+esm1

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

References:
  https://ubuntu.com/security/notices/USN-5625-1
  CVE-2022-40023

Package Information:
  https://launchpad.net/ubuntu/+source/mako/1.1.3+ds1-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/mako/1.1.0+ds1-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/mako/1.0.7+ds1-1ubuntu0.2