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Fedora Python-Tornado Critical Denial of Service Attack Fix 2026-23656e6d2f

fedora
Calendar Grey July 11, 2026
Dist Fedora Esm H88
Update for Fedora 43 addresses critical CVE-2026-35536 and CVE-2026-31958 vulnerabilities in Python Tornado.
Update to 6.5.7 - CVE-2026-35536 (rhbz#2457335), CVE-2026-31958 (rhbz#2451660)

Summary

Tornado is an open source version of the scalable, non-blocking web

server and tools.

The framework is distinct from most mainstream web server frameworks

(and certainly most Python frameworks) because it is non-blocking and

reasonably fast. Because it is non-blocking and uses epoll, it can

handle thousands of simultaneous standing connections, which means it is

ideal for real-time web services.

Update Information:

Update to 6.5.7 - CVE-2026-35536 (rhbz#2457335), CVE-2026-31958 (rhbz#2451660)

Topics%20covered

Topics Covered

security advisory denial of service fedora important cookie injection python-tornado

Change Log

* Mon Jun 22 2026 Peter Robinson - 6.5.7-1 - Update to 6.5.7 - CVE-2026-35536 (rhbz#2457335), CVE-2026-31958 (rhbz#2451660) * Wed Jun 3 2026 Python Maint - 6.5.2-6 - Rebuilt for Python 3.15 * Tue May 19 2026 Karolina Surma - 6.5.2-5 - Fix compatibility with Python 3.15 * Sat Jan 17 2026 Fedora Release Engineering - 6.5.2-4 - Rebuilt for https://fedoraproject.org/wiki/Fedora_44_Mass_Rebuild

References


[ 1 ] Bug #2451660 - CVE-2026-31958 python-tornado: Tornado: Denial of Service via large multipart bodies [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2451660 [ 2 ] Bug #2457335 - CVE-2026-35536 python-tornado: Tornado: Cookie attribute injection due to improper handling of cookie arguments [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2457335

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-23656e6d2f' 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: python-tornado
Product: Fedora 43
Version: 6.5.7
Release: 1.fc43
URL: https://www.tornadoweb.org
Summary: Scalable, non-blocking web server and tools

Topics%20covered

Topics Covered

security advisory denial of service fedora important cookie injection python-tornado

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