Fedora 43 Python3.11 Important Advisory for CVE-2026-1299 and Others
fedora
March 7, 2026
Security fixes for CVE-2026-1299, CVE-2026-0865, CVE-2025-15366 and CVE-2025-15367
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 fixes for CVE-2026-1299, CVE-2026-0865, CVE-2025-15366 and CVE-2025-15367
Topics Covered
Change Log
* Mon Feb 9 2026 Tom\u0161 Hrn\u010diar
References
[ 1 ] Bug #2431626 - CVE-2025-15366 python3.11: IMAP command injection in user-controlled commands [fedora-43]
https://bugzilla.redhat.com/show_bug.cgi?id=2431626
[ 2 ] Bug #2431650 - CVE-2025-15367 python3.11: POP3 command injection in user-controlled commands [fedora-43]
https://bugzilla.redhat.com/show_bug.cgi?id=2431650
[ 3 ] Bug #2431826 - CVE-2026-0865 python3.11: wsgiref.headers.Headers allows header newline injection in Python [fedora-43]
https://bugzilla.redhat.com/show_bug.cgi?id=2431826
[ 4 ] Bug #2433826 - CVE-2026-1299 python3.11: email header injection due to unquoted newlines [fedora-43]
https://bugzilla.redhat.com/show_bug.cgi?id=2433826
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-f17f6e94ca' 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
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Critical
Name: python3.11
Product: Fedora 43
Version: 3.11.14
Release: 5.fc43
Summary: Version 3.11 of the Python interpreter
Topics Covered
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