# 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.

- Web page: https://patchblox.com/security/cve/CVE-2025-50182
- Priority: Routine
- CVSS: 6.1 (Medium)
- EPSS: 0.0060
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 19, 2025
- Weakness: URL Redirection to Untrusted Site ('Open Redirect')
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-50182

## Description

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

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-urllib3 Debian 13.5 (trixie) | 2.3.0-3 | [DEBIAN-CVE-2025-50182](https://patchblox.com/security/data/fix/linux/debian-cve-2025-50182.md) | Jun 19, 2025 |
| Linux | python-urllib3 Debian 14 | 2.3.0-3 | [DEBIAN-CVE-2025-50182](https://patchblox.com/security/data/fix/linux/debian-cve-2025-50182.md) | Jun 19, 2025 |
| Linux | python3-urllib3 Ubuntu 25.04 (plucky) | 2.3.0-2ubuntu0.1 | [python3-urllib3 2.3.0-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-python3-urllib3-2.3.0-2ubuntu0.1.md) | Jan 16, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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