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Debian LTS Advisory DLA-4421-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Guilhem Moulin
December 26, 2025 https://wiki.debian.org/LTS
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Package : python-urllib3
Version : 1.26.5-1~exp1+deb11u2
CVE ID : CVE-2025-50181 CVE-2025-66418
Debian Bug : 1108076 1122030
Vulnerabilities were found in python-urllib3, an HTTP library with
thread-safe connection pooling for Python, which could lead to denial of
service or request forgery.
CVE-2025-50181
Redirects were not disabled when retries are disabled on PoolManager
instantiation. An application attempting to mitigate SSRF or open
redirect vulnerabilities by disabling redirects at the PoolManager
level remained vulnerable.
CVE-2025-66418
The number of links in the decompression chain was unbounded,
allowing a malicious server to insert a virtually unlimited number
of compression steps which could lead to denial of service.
For Debian 11 bullseye, these problems have been fixed in version
1.26.5-1~exp1+deb11u2.
We recommend that you upgrade your python-urllib3 packages.
For the detailed security status of python-urllib3 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/python-urllib3
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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