CVE-2025-50181: medium-severity vulnerability in urllib3
urllib3 redirects are not disabled when retries are disabled on PoolManager instantiation
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.5%
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.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected products
urllib3 · urllib3Related CVEs — urllib3
In the same product, most dangerous first.
CVE-2026-21441HIGHurllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)EPSS 2.9%CVE-2023-43804MEDIUM`Cookie` HTTP header isn't stripped on cross-origin redirectsEPSS 1.4%CVE-2024-37891MEDIUMProxy-Authorization request header isn't stripped during cross-origin redirects in urllib3EPSS 1.1%CVE-2025-66471HIGHurllib3 Streaming API improperly handles highly compressed dataEPSS 0.7%CVE-2025-66418HIGHurllib3 allows an unbounded number of links in the decompression chainEPSS 0.7%CVE-2026-44432HIGHurllib3: Decompression-bomb safeguards bypassed in parts of the streaming APIEPSS 0.7%