Improper Certificate Validation Affecting urllib3 package, versions [1.26.0,1.26.4)


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.19% (57th percentile)

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  • Snyk IDSNYK-PYTHON-URLLIB3-1085966
  • published16 Mar 2021
  • disclosed16 Mar 2021
  • creditJorge, Quentin Pradet

Introduced: 16 Mar 2021

CVE-2021-28363  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

Upgrade urllib3 to version 1.26.4 or higher.

Overview

urllib3 is a HTTP library with thread-safe connection pooling, file post, and more.

Affected versions of this package are vulnerable to Improper Certificate Validation. It 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 SSLContext will be silently accepted.

References

CVSS Scores

version 3.1