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Fedora 41: python-kdcproxy DoS TCP Buffer Overflow CVE-2025-59089

fedora
Calendar Grey December 5, 2025
Dist Fedora Esm H88
New Fedora 41 update for python-kdcproxy addresses DoS and DNS discovery issues. Enhance security now by updating your system.
New upstream version (1.1.0) Use DNS discovery for declared realms only (CVE-2025-59088) Fix DoS vulnerability based on unbounded TCP buffering (CVE-2025-59089)

Summary

This package contains a Python WSGI module for proxying KDC requests over

HTTP by following the MS-KKDCP protocol. It aims to be simple to deploy, with

minimal configuration.

Update Information:

New upstream version (1.1.0) Use DNS discovery for declared realms only (CVE-2025-59088) Fix DoS vulnerability based on unbounded TCP buffering (CVE-2025-59089)

Topics%20covered

Topics Covered

security advisory fedora DoS python-kdcproxy cve-2025-59089 unbounded tcp buffering

Change Log

* Wed Nov 19 2025 Julien Rische - 1.1.0-1 - New upstream version (1.1.0) - Use DNS discovery for declared realms only (CVE-2025-59088) Resolves: rhbz#2414550 - Fix DoS vulnerability based on unbounded TCP buffering (CVE-2025-59089) Resolves: rhbz#2414552

References


[ 1 ] Bug #2414550 - CVE-2025-59088 python-kdcproxy: Unauthenticated SSRF via Realm\u2011Controlled DNS SRV [fedora-41] https://bugzilla.redhat.com/show_bug.cgi?id=2414550 [ 2 ] Bug #2414552 - CVE-2025-59089 python-kdcproxy: Remote DoS via unbounded TCP upstream buffering [fedora-41] https://bugzilla.redhat.com/show_bug.cgi?id=2414552

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2025-3075610004' 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: python-kdcproxy
Product: Fedora 41
Version: 1.1.0
Release: 1.fc41
URL: https://github.com/latchset/kdcproxy
Summary: MS-KKDCP (kerberos proxy) WSGI module

Topics%20covered

Topics Covered

security advisory fedora DoS python-kdcproxy cve-2025-59089 unbounded tcp buffering

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