Debian: python-urllib3 Critical Denial of Service CVE-2025-50181 DLA-4421-1

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/source-package/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