CVE-2025-59089

Ecosystem	Package	Version

Vulnerabilities

CVE-2025-59089

If an attacker causes kdcproxy to connect to an attacker-controlled KDC server (e.g. through server-side request forgery), they can exploit the fact that kdcproxy does not enforce bounds on TCP response length to conduct a denial-of-service attack. While receiving the KDC's response, kdcproxy copies the entire buffered stream into a new buffer on each recv() call, even when the transfer is incomplete, causing excessive memory allocation and CPU usage. Additionally, kdcproxy accepts incoming response chunks as long as the received data length is not exactly equal to the length indicated in the response header, even when individual chunks or the total buffer exceed the maximum length of a Kerberos message. This allows an attacker to send unbounded data until the connection timeout is reached (approximately 12 seconds), exhausting server memory or CPU resources. Multiple concurrent requests can cause accept queue overflow, denying service to legitimate clients.

Published Nov 14, 2025

https://access.redhat.com/security/cve/CVE-2025-59089 https://bugzilla.redhat.com/show_bug.cgi?id=2393958

CVSS ScoreHigh

8.2


pypi	kdcproxy	0.3.1
pypi	kdcproxy	0.4.1
pypi	kdcproxy	0.4.2
pypi	kdcproxy	0.4
pypi	kdcproxy	1.0.0
rpm	python-kdcproxy	0.3.2-1.el7
rpm	python-kdcproxy	0.3.2-2.el7
rpm	python-kdcproxy	0.3.2-3.el7
rpm	python-kdcproxy	0.4-3.module+el8+5194+1459f29b
rpm	python-kdcproxy	0.4-3.module+el8.1.0+5409+d30b476c
rpm	python-kdcproxy	0.4-5.module+el8.10.0+90484+ef47c6ef.1
rpm	python-kdcproxy	0.4-5.module+el8.10.0+90553+1bd85afa.1
rpm	python-kdcproxy	0.4-5.module+el8.10.0+90703+a2faa53f.2
rpm	python-kdcproxy	0.4-5.module+el8.2.0+5596+233bd6ae
rpm	python-kdcproxy	0.4-5.module+el8.3.0+7868+2151076c
rpm	python-kdcproxy	0.4-5.module+el8.9.0+90048+ed04e4cc
rpm	python-kdcproxy	0.4-5.module+el8.9.0+90122+3305dc1d
rpm	python-kdcproxy	1.0.0-16.el10
rpm	python-kdcproxy	1.0.0-18.el10
rpm	python-kdcproxy	1.0.0-19.el10_1
rpm	python-kdcproxy	1.0.0-7.el9
rpm	python3-kdcproxy	0.4-3.module+el8+5194+1459f29b
rpm	python3-kdcproxy	0.4-3.module+el8.1.0+5409+d30b476c
rpm	python3-kdcproxy	0.4-5.module+el8.2.0+5596+233bd6ae
rpm	python3-kdcproxy	0.4-5.module+el8.3.0+7868+2151076c
rpm	python3-kdcproxy	0.4-5.module+el8.9.0+90048+ed04e4cc
rpm	python3-kdcproxy	0.4-5.module+el8.9.0+90122+3305dc1d
rpm	python3-kdcproxy	1.0.0-16.el10
rpm	python3-kdcproxy	1.0.0-18.el10
rpm	python3-kdcproxy	1.0.0-7.el9

Ecosystem	Package	Version

CVE-2025-59089 | Components Impacted | Sonatype Guide | Sonatype Guide

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CVE-2025-59089