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

urllib3 redirects are not disabled when retries are disabled on PoolManager instantiation

CVE-2025-50181

Description

urllib3 is a user-friendly HTTP client library for Python. Prior to 2.5.0, it is possible to disable redirects for all requests by instantiating a PoolManager and specifying retries in a way that disable redirects. By default, requests and botocore users are not affected. An application attempting to mitigate SSRF or open redirect vulnerabilities by disabling redirects at the PoolManager level will remain vulnerable. 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
< 2.5.02.5.0

Affected products

232

Patches

Vulnerability mechanics

References

5

News mentions

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