CVE-2025-50182

Name	CVE-2025-50182
Description	urllib3 is a user-friendly HTTP client library for Python. Starting in version 2.2.0 and prior to 2.5.0, urllib3 does not control redirects in browsers and Node.js. urllib3 supports being used in a Pyodide runtime utilizing the JavaScript Fetch API or falling back on XMLHttpRequest. This means Python libraries can be used to make HTTP requests from a browser or Node.js. Additionally, urllib3 provides a mechanism to control redirects, but the retries and redirect parameters are ignored with Pyodide; the runtime itself determines redirect behavior. This issue has been patched in version 2.5.0.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1108077

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-urllib3 (PTS)	bullseye	1.26.5-1~exp1	vulnerable
	bullseye (security)	1.26.5-1~exp1+deb11u1	vulnerable
	bookworm	1.26.12-1+deb12u1	vulnerable
	trixie, sid	2.3.0-2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-urllib3	source	(unstable)	(unfixed)			1108077

Notes

[bookworm] - python-urllib3 <no-dsa> (Minor issue)
[bullseye] - python-urllib3 <postponed> (Minor issue)
https://github.com/urllib3/urllib3/security/advisories/GHSA-48p4-8xcf-vxj5
https://github.com/urllib3/urllib3/commit/7eb4a2aafe49a279c29b6d1f0ed0f42e9736194f (2.5.0)