Python is vulnerable to CRLF Injection. Remote unauthenticated attacker could exploit the flaw by controling a url parameter, as demonstrated by the first argument to urllib.request.urlopen with \r\n (specifically in the path component of a URL that lacks a ? character) followed by an HTTP header or a Redis command.
lists.opensuse.org/opensuse-security-announce/2019-10/msg00062.html
lists.opensuse.org/opensuse-security-announce/2019-10/msg00063.html
lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
www.openwall.com/lists/oss-security/2021/02/04/2
access.redhat.com/errata/RHSA-2019:1260
access.redhat.com/errata/RHSA-2019:2030
access.redhat.com/errata/RHSA-2019:3335
access.redhat.com/errata/RHSA-2019:3520
access.redhat.com/errata/RHSA-2019:3725
access.redhat.com/security/updates/classification/#important
bugs.python.org/issue35906
bugzilla.redhat.com/show_bug.cgi?id=1709349
lists.debian.org/debian-lts-announce/2019/06/msg00022.html
lists.debian.org/debian-lts-announce/2019/06/msg00023.html
lists.debian.org/debian-lts-announce/2019/06/msg00026.html
lists.debian.org/debian-lts-announce/2020/07/msg00011.html
lists.debian.org/debian-lts-announce/2020/08/msg00034.html
lists.fedoraproject.org/archives/list/[email protected]/message/JMWSKTNOHSUOT3L25QFJAVCFYZX46FYK/
lists.fedoraproject.org/archives/list/[email protected]/message/JXASHCDD4PQFKTMKQN4YOP5ZH366ABN4/
security.gentoo.org/glsa/202003-26
security.netapp.com/advisory/ntap-20190404-0004/
usn.ubuntu.com/4127-1/
usn.ubuntu.com/4127-2/