Improper Certificate Validation Affecting python-urllib3 package, versions <1.26.4-1


Severity

Recommended
0.0
medium
0
10

Snyk's Security Team recommends NVD's CVSS assessment. Learn more

Threat Intelligence

Exploit Maturity
Not Defined
EPSS
0.18% (57th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-DEBIANUNSTABLE-PYTHONURLLIB3-1085858
  • published16 Mar 2021
  • disclosed15 Mar 2021

Introduced: 15 Mar 2021

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

How to fix?

Upgrade Debian:unstable python-urllib3 to version 1.26.4-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-urllib3 package and not the python-urllib3 package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.

CVSS Scores

version 3.1