Fedora 42 python3.9 Important Update Denial of Service CVE-2025-12084
fedora
January 24, 2026
Security fix for CVE-2025-12084
Summary
Python 3.9 package for developers.
This package exists to allow developers to test their code against an older
version of Python. This is not a full Python stack and if you wish to run
your applications with Python 3.9, see other distributions
that support it, such as CentOS or RHEL or older Fedora releases.
Update Information:
Security fix for CVE-2025-12084
Topics Covered
Change Log
* Wed Jan 14 2026 Lumr Balhar
References
[ 1 ] Bug #2422519 - CVE-2025-12084 python3.9: cpython: Quadratic algorithm in xml.dom.minidom leads to denial of service [fedora-42]
https://bugzilla.redhat.com/show_bug.cgi?id=2422519
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-43e2b1e209' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label
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Severity
important
Lowest
Low
Medium
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Critical
Name: python3.9
Product: Fedora 42
Version: 3.9.25
Release: 3.fc42
Summary: Version 3.9 of the Python interpreter
Topics Covered
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