The CGIHandler class in Python before 2.7.12 does not protect against the HTTP_PROXY variable name clash in a CGI script, which could allow a remote attacker to redirect HTTP requests.
lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-1000110
bugzilla.suse.com/show_bug.cgi?id=CVE-2016-1000110
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7K3WFJO3SJQCODKRKU6EQV3ZGHH53YPU/
security-tracker.debian.org/tracker/CVE-2016-1000110