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PYSEC-2021-59

Details

The urllib3 library 1.26.x before 1.26.4 for Python omits SSL certificate validation in some cases involving HTTPS to HTTPS proxies. The initial connection to the HTTPS proxy (if an SSLContext isn't given via proxy_config) doesn't verify the hostname of the certificate. This means certificates for different servers that still validate properly with the default urllib3 SSLContext will be silently accepted.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI / urllib3

Introduced in: 0 Fixed in: 8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0

Fix pip install --upgrade 'urllib3>=8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0'

References

https://github.com/urllib3/urllib3/commits/main [WEB]
https://pypi.org/project/urllib3/1.26.4/ [PACKAGE]
https://github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0 [FIX]
https://github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2r [ADVISORY]