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The urllib3 library before 1.24.2 for Python mishandles certain cases where the desired set of CA certificates is different from the OS store of CA certificates, which results in SSL connections succeeding in situations where a verification failure is the correct outcome. This is related to use of the ssl_context, ca_certs, or ca_certs_dir argument.

🗓️ 03 Sep 2025 23:00:29Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 2 Views

urllib3 before 1.24.2 mishandles mismatched certificates via secure sockets layer context or certificate store, enabling incorrect verification.

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03 Sep 2025 23:00Current
9.6High risk
Vulners AI Score9.6
CVSS 25
CVSS 37.5
EPSS0.01015
certificate authoritiescertificate filescertificate storecertificate verificationsecure sockets layer context
2