This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2021-28363 →

DEBIAN-CVE-2021-28363

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 conne...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 python-urllib3

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.26.4-1"}]}]

Debian:13 python-urllib3

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.26.4-1"}]}]

Debian:14 python-urllib3

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.26.4-1"}]}]

References

advisory security-tracker.debian.org