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Fedora 44 python3.9 Security Fix CVE-2026-4786 CVE-2026-6100 Advisory

fedora
Calendar Grey April 30, 2026
Dist Fedora Esm H88
Security fixes address CVE-2026-4786 and CVE-2026-6100 in python3.9 for Fedora 44, improving system safety.
Security fixes for CVE-2026-4786 and CVE-2026-6100

Summary

Python 3.9 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 python3.9 package provides the "python3.9" executable: the reference

interpreter for the Python language, version 3.

The majority of its standard library is provided in the python3.9-libs package,

which should be installed automatically along with python3.9.

The remaining parts of the Python standard library are broken out into the

python3.9-tkinter and python3.9-test packages, which may need to be installed

separately.

Documentation for Python is provided in the python3.9-docs package.

Packages containing additional libraries for Python are generally named with

the "python3.9-" prefix.

Update Information:

Security fixes for CVE-2026-4786 and CVE-2026-6100

Topics%20covered

Topics Covered

security advisory fedora arbitrary code execution information disclosure security issues python3.9

Change Log

* Fri Apr 17 2026 Charalampos Stratakis - 3.9.25-9 - Security fixes for CVE-2026-4786 and CVE-2026-6100 Resolves: rhbz#2458019, rhbz#2458227 * Sat Apr 11 2026 Miro Hron\u010dok - 3.9.25-8 - Explicitly build with OpenSSL 3

References


[ 1 ] Bug #2458019 - CVE-2026-6100 python3.9: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2458019 [ 2 ] Bug #2458227 - CVE-2026-4786 python3.9: Python: Arbitrary code execution via command injection in webbrowser.open() API [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2458227

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-85cf3694d8' 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
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Critical

Name: python3.9
Product: Fedora 44
Version: 3.9.25
Release: 9.fc44
URL: https://www.python.org/
Summary: Version 3.9 of the Python interpreter

Topics%20covered

Topics Covered

security advisory fedora arbitrary code execution information disclosure security issues python3.9

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