CVE-2025-50182

urllib3 does not control redirects in browsers and Node.js

CVE-2025-50182 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2025-50182, released June 19, 2025. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.1

Medium

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0060

49th percentile

urllib3 is a user-friendly HTTP client library for Python. Starting inversion 2.2.0 and prior to 2.5.0, urllib3 does not control redirects inbrowsers and Node.js. urllib3 supports being used in a Pyodide runtimeutilizing the JavaScript Fetch API or falling back on XMLHttpRequest. Thismeans Python libraries can be used to make HTTP requests from a browser orNode.js. Additionally, urllib3 provides a mechanism to control redirects,but the retries and redirect parameters are ignored with Pyodide; theruntime itself determines redirect behavior. This issue has been patched inversion 2.5.0.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
python-urllib3 · Debian 13.5 (trixie)	2.3.0-3	DEBIAN-CVE-2025-50182	Jun 19, 2025
python-urllib3 · Debian 14	2.3.0-3	DEBIAN-CVE-2025-50182	Jun 19, 2025
python3-urllib3 · Ubuntu 25.04 (plucky)	2.3.0-2ubuntu0.1	python3-urllib3 2.3.0-2ubuntu0.1	Jan 16, 2026

Details

Published
June 19, 2025
Weakness
URL Redirection to Untrusted Site ('Open Redirect')
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-50182

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