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Fedora 42 python3.10 Critical DoS Issues Advisory 2026-66ae29ad2c

fedora
Calendar Grey March 15, 2026
Dist Fedora Esm H88
Critical updates for Fedora 42's Python 3.10 security issues enhance system reliability against potential attacks.
Update to 3.10.20

Summary

Python 3.10 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 python3.10 package provides the "python3.10" executable: the reference

interpreter for the Python language, version 3.

The majority of its standard library is provided in the python3.10-libs package,

which should be installed automatically along with python3.10.

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

python3.10-tkinter and python3.10-test packages, which may need to be installed

separately.

Documentation for Python is provided in the python3.10-docs package.

Packages containing additional libraries for Python are generally named with

the "python3.10-" prefix.

Update Information:

Update to 3.10.20

Topics%20covered

Topics Covered

security advisory denial of service fedora update critical python3.10

Change Log

* Tue Mar 3 2026 Tom\u0161 Hrn\u010diar - 3.10.20-1 - Update to 3.10.20

References


[ 1 ] Bug #2421616 - CVE-2025-12084 python3.10: cpython: Quadratic algorithm in xml.dom.minidom leads to denial of service [fedora-42] https://bugzilla.redhat.com/show_bug.cgi?id=2421616 [ 2 ] Bug #2428931 - CVE-2025-13836 python3.10: Excessive read buffering DoS in http.client [fedora-42] https://bugzilla.redhat.com/show_bug.cgi?id=2428931 [ 3 ] Bug #2431756 - CVE-2025-11468 python3.10: Missing character filtering in Python [fedora-42] https://bugzilla.redhat.com/show_bug.cgi?id=2431756 [ 4 ] Bug #2431765 - CVE-2026-0672 python3.10: Header injection in http.cookies.Morsel in Python [fedora-42] https://bugzilla.redhat.com/show_bug.cgi?id=2431765 [ 5 ] Bug #2431795 - CVE-2025-15282 python3.10: Header injection via newlines in data URL mediatype in Python [fedora-42] https://bugzilla.redhat.com/show_bug.cgi?id=2431795

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-66ae29ad2c' 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
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Name: python3.10
Product: Fedora 42
Version: 3.10.20
Release: 1.fc42
URL: https://www.python.org/
Summary: Version 3.10 of the Python interpreter

Topics%20covered

Topics Covered

security advisory denial of service fedora update critical python3.10

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