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Critical Update for Decompression Issues in Fedora 42 mingw-python-urllib3

fedora
Calendar Grey January 31, 2026
Dist Fedora Esm H88
Fedora 42 update for mingw-python-urllib3 addresses multiple security issues critical for functionality and safety.
Update to 2.6.3, fixes CVE-2025-66471, CVE-2025-21441, CVE-2025-66418.

Summary

MinGW Windows Python urllib3.

Update Information:

Update to 2.6.3, fixes CVE-2025-66471, CVE-2025-21441, CVE-2025-66418.

Topics%20covered

Topics Covered

security advisory fedora DoS importance mingw-python-urllib3 decompression-chain

Change Log

* Fri Jan 9 2026 Sandro Mani - 2.6.3-1 - Update to 2.6.3 * Sat Dec 13 2025 Sandro Mani - 2.6.2-1 - Update to 2.6.2 * Fri Aug 15 2025 Sandro Mani - 2.5.0-1 - Update to 2.5.0 * Thu Jul 24 2025 Fedora Release Engineering - 2.4.0-2 - Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild * Wed Apr 16 2025 Sandro Mani - 2.4.0-1 - Update to 2.4.0

References


[ 1 ] Bug #2431299 - CVE-2025-66471 mingw-python-urllib3: urllib3 Streaming API improperly handles highly compressed data [fedora-42] https://bugzilla.redhat.com/show_bug.cgi?id=2431299 [ 2 ] Bug #2431302 - CVE-2025-66471 mingw-python-urllib3: urllib3 Streaming API improperly handles highly compressed data [fedora-43] https://bugzilla.redhat.com/show_bug.cgi?id=2431302 [ 3 ] Bug #2431306 - CVE-2026-21441 mingw-python-urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API) [fedora-42] https://bugzilla.redhat.com/show_bug.cgi?id=2431306 [ 4 ] Bug #2431309 - CVE-2026-21441 mingw-python-urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API) [fedora-43] https://bugzilla.redhat.com/show_bug.cgi?id=2431309 [ 5 ] Bug #2431356 - CVE-2025-66418 mingw-python-urllib3: urllib3: Unbounded decompression chain leads to resource exhausti...

Read the Full Advisory

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-2b6dfd7c83' 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
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Critical

Name: mingw-python-urllib3
Product: Fedora 42
Version: 2.6.3
Release: 1.fc42
URL: https://urllib3.readthedocs.io/en/latest/
Summary: MinGW Windows Python urllib3

Topics%20covered

Topics Covered

security advisory fedora DoS importance mingw-python-urllib3 decompression-chain

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