Debian 9: DLA-2686-1 Critical: python-urllib3 Multiple Security Flaws

CVE-2018-20060

Urllib3 does not remove the Authorization HTTP header when
following a cross-origin redirect (i.e., a redirect that differs
in host, port, or scheme). This can allow for credentials in the
Authorization header to be exposed to unintended hosts or
transmitted in cleartext.

CVE-2019-11236

CRLF injection is possible if the attacker controls the request
parameter.

CVE-2019-11324

Urllib3 mishandles certain cases where the desired set of CA
certificates is different from the OS store of CA certificates,
which results in SSL connections succeeding in situations where a
verification failure is the correct outcome. This is related to
use of the ssl_context, ca_certs, or ca_certs_dir argument.

CVE-2020-26137

Urllib3 allows CRLF injection if the attacker controls the HTTP
request method, as demonstrated by inserting CR and LF control
characters in the first argument of putrequest().