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Fedora 43 Python 3.11 Critical Security Fix for CVE-2026-9526 Vulnerability

fedora
Calendar Grey April 28, 2026
Dist Fedora Esm H88
Security fixes for Python 3.11 on Fedora address multiple critical issues, enhancing system integrity and performance.
Security fixes for CVE-2026-1502, CVE-2026-4786, CVE-2026-6100, CVE-2026-2297, CVE 2026-3644, CVE-2026-4224

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-2026-1502, CVE-2026-4786, CVE-2026-6100, CVE-2026-2297, CVE 2026-3644, CVE-2026-4224

Topics%20covered

Topics Covered

security advisory fedora arbitrary code execution important command injection python3.11

Change Log

* Fri Apr 17 2026 Charalampos Stratakis - 3.11.15-4 - Security fixes for CVE-2026-1502, CVE-2026-4786, CVE-2026-6100, CVE-2026-2297, CVE 2026-3644, CVE-2026-4224 Resolves: rhbz#2457941, rhbz#2458221, rhbz#2458013, rhbz#2444704, rhbz#2448188, rhbz#2448204 * Sat Apr 11 2026 Miro Hron\u010dok - 3.11.15-3 - Explicitly build with OpenSSL 3

References


[ 1 ] Bug #2444704 - CVE-2026-2297 python3.11: CPython: Logging Bypass in Legacy .pyc File Handling [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2444704 [ 2 ] Bug #2448188 - CVE-2026-3644 python3.11: Incomplete control character validation in http.cookies [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2448188 [ 3 ] Bug #2448204 - CVE-2026-4224 python3.11: Stack overflow parsing XML with deeply nested DTD content models [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2448204 [ 4 ] Bug #2457941 - CVE-2026-1502 python3.11: Python: HTTP header injection via CR/LF in proxy tunnel headers [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2457941 [ 5 ] Bug #2458013 - CVE-2026-6100 python3.11: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2458013 [ 6 ] Bug #2458221 - CVE-2026-4786 python3.1...

Read the Full Advisory

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-952616f3d6' 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

Severity
important
Lowest
Low
Medium
High
Critical

Name: python3.11
Product: Fedora 43
Version: 3.11.15
Release: 4.fc43
URL: https://www.python.org/
Summary: Version 3.11 of the Python interpreter

Topics%20covered

Topics Covered

security advisory fedora arbitrary code execution important command injection python3.11

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