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Moderate severityNVD Advisory· Published Jun 19, 2025· Updated Dec 22, 2025

urllib3 does not control redirects in browsers and Node.js

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
urllib3PyPI
>= 2.2.0, < 2.5.02.5.0

Affected products

318

Patches

Vulnerability mechanics

References

5

News mentions

0

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