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.
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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2021-03-15T00:00:00

Updated: 2024-08-03T21:40:14.323Z

Reserved: 2021-03-13T00:00:00

Link: CVE-2021-28363

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2021-03-15T18:15:19.017

Modified: 2024-06-21T19:15:17.763

Link: CVE-2021-28363

cve-icon Redhat

Severity : Moderate

Publid Date: 2021-03-15T00:00:00Z

Links: CVE-2021-28363 - Bugzilla