CVE-2025-50182CWE-601

urllib3 does not control redirects in browsers and Node.js

Medium · published June 19, 2025

CVSS v3.1
5.3
EPSS
0%
Percentile
32.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00393 · 32.3th percentile
Weakness
CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
Published
2025-06-19T01:42Z
EPSS history
Timeline
  • 19 JUN 01:42Z
    urllib3 does not control redirects in browsers and Node.js
    cvelistv5