Fedora 43 Python 3.11 Security Update CVE-2025-13836 DoS Vulnerability
fedora
January 25, 2026
Security fix for CVE-2025-13836 Security fix for CVE-2025-12084
Summary
Python 3.11 is an accessible, high-level, dynamically typed, interpreted
programming language, designed with an emphasis on code readability.
It includes an extensive standard library, and has a vast ecosystem of
third-party libraries.
The python3.11 package provides the "python3.11" executable: the reference
interpreter for the Python language, version 3.
The majority of its standard library is provided in the python3.11-libs package,
which should be installed automatically along with python3.11.
The remaining parts of the Python standard library are broken out into the
python3.11-tkinter and python3.11-test packages, which may need to be installed
separately.
Documentation for Python is provided in the python3.11-docs package.
Packages containing additional libraries for Python are generally named with
the "python3.11-" prefix.
Update Information:
Security fix for CVE-2025-13836 Security fix for CVE-2025-12084
Topics Covered
Change Log
* Fri Jan 16 2026 Lumr Balhar
References
[ 1 ] Bug #2421636 - CVE-2025-12084 python3.11: cpython: Quadratic algorithm in xml.dom.minidom leads to denial of service [fedora-43]
https://bugzilla.redhat.com/show_bug.cgi?id=2421636
[ 2 ] Bug #2428942 - CVE-2025-13836 python3.11: Excessive read buffering DoS in http.client [fedora-43]
https://bugzilla.redhat.com/show_bug.cgi?id=2428942
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-36e1e6958c' 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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Name: python3.11
Product: Fedora 43
Version: 3.11.14
Release: 4.fc43
Summary: Version 3.11 of the Python interpreter
Topics Covered
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