CVE-2025-50182: Python URLLIB3

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Python URLLIB3: from 2.2.0, before 2.5.0 (fixed in 2.5.0)

Published 2025-06-19. Last modified 2026-06-17.