Open Redirect Affecting urllib3 package, versions [,2.5.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-URLLIB3-10390193
- published19 Jun 2025
- disclosed18 Jun 2025
- creditIllia Volochii
Introduced: 18 Jun 2025
NewCVE-2025-50182 (opens in a new tab)How to fix?
Upgrade urllib3 to version 2.5.0 or higher.
Overview
urllib3 is a HTTP library with thread-safe connection pooling, file post, and more.
Affected versions of this package are vulnerable to Open Redirect when used within a Pyodide runtime utilizing the JavaScript Fetch API or falling back on XMLHttpRequest, due to the retries and redirect parameters being ignored and the runtime determining redirect behavior. An attacker can access sensitive information by leveraging uncontrolled redirects in browsers or Node.js environments.
Notes:
This is only exploitable if the application relies on the
retriesandredirectparameters to limit or prevent redirects;This issue was fixed in version 2.5.0 for Node.js environments but not for browsers due to
XMLHttpRequestproviding no control over redirects. Default browser behavior for redirects should be expected.