Fedora 43 mingw-python-urllib3 Critical Update CVE-2025-66471
fedora
January 31, 2026
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 Covered
Change Log
* Fri Jan 9 2026 Sandro Mani
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...
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-8b7270b473' 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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Name: mingw-python-urllib3
Product: Fedora 43
Version: 2.6.3
Release: 1.fc43
Summary: MinGW Windows Python urllib3
Topics Covered
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