Slixmpp before 1.8.3 lacks SSL Certificate hostname validation in XMLStream, allowing an attacker to pose as any server in the eyes of Slixmpp.
https://security.gentoo.org/glsa/202305-07
https://lab.louiz.org/poezio/slixmpp/-/commits/master
https://lab.louiz.org/poezio/slixmpp/-/commit/b60b1b985db928532f97c4f61d6fbc801f0aa7fa
https://github.com/poezio/slixmpp/tags
https://github.com/poezio/slixmpp/commits/master/slixmpp/xmlstream/xmlstream.py