Fedora 42 Python 3.14 Important Header Injection Fix FEDORA-2026-9ad2d11c1f
fedora
February 20, 2026
New version of the Python interpreter also bringing security fixes.
Summary
Python 3.14 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 python3.14 package provides the "python3.14" executable: the reference
interpreter for the Python language, version 3.
The majority of its standard library is provided in the python3.14-libs package,
which should be installed automatically along with python3.14.
The remaining parts of the Python standard library are broken out into the
python3.14-tkinter and python3.14-test packages, which may need to be installed
separately.
Documentation for Python is provided in the python3.14-docs package.
Packages containing additional libraries for Python are generally named with
the "python3.14-" prefix.
Update Information:
New version of the Python interpreter also bringing security fixes.
Topics Covered
Change Log
* Wed Feb 4 2026 Karolina Surma
References
[ 1 ] Bug #2431785 - CVE-2025-11468 python3.14: Missing character filtering in Python [fedora-42]
https://bugzilla.redhat.com/show_bug.cgi?id=2431785
[ 2 ] Bug #2431794 - CVE-2026-0672 python3.14: Header injection in http.cookies.Morsel in Python [fedora-42]
https://bugzilla.redhat.com/show_bug.cgi?id=2431794
[ 3 ] Bug #2431800 - CVE-2026-0865 python3.14: wsgiref.headers.Headers allows header newline injection in Python [fedora-42]
https://bugzilla.redhat.com/show_bug.cgi?id=2431800
[ 4 ] Bug #2431816 - CVE-2025-15282 python3.14: Header injection via newlines in data URL mediatype in Python [fedora-42]
https://bugzilla.redhat.com/show_bug.cgi?id=2431816
[ 5 ] Bug #2433819 - CVE-2026-1299 python3.14: email header injection due to unquoted newlines [fedora-42]
https://bugzilla.redhat.com/show_bug.cgi?id=2433819
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-9ad2d11c1f' 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
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Critical
Name: python3.14
Product: Fedora 42
Version: 3.14.3
Release: 1.fc42
Summary: Version 3.14 of the Python interpreter
Topics Covered
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