CVE-2025-50181: urllib3 redirects are not disabled when retries are disabled on PoolManager instantiation

June 18, 2025 (updated December 22, 2025)

urllib3 handles redirects and retries using the same mechanism, which is controlled by the Retry object. The most common way to disable redirects is at the request level, as follows:

resp = urllib3.request("GET", "https://httpbin.org/redirect/1", redirect=False)
print(resp.status)

References

github.com/advisories/GHSA-pq67-6m6q-mj2v
github.com/urllib3/urllib3
github.com/urllib3/urllib3/commit/f05b1329126d5be6de501f9d1e3e36738bc08857
github.com/urllib3/urllib3/releases/tag/2.5.0
github.com/urllib3/urllib3/security/advisories/GHSA-pq67-6m6q-mj2v
nvd.nist.gov/vuln/detail/CVE-2025-50181

Code Behaviors & Features

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