pysaml2 version 4.4.0 and older accept any password when run with python optimizations enabled. This allows attackers to log in as any user without knowing their password.
https://security.gentoo.org/glsa/201801-11
https://lists.debian.org/debian-lts-announce/2021/02/msg00038.html
https://lists.debian.org/debian-lts-announce/2018/07/msg00000.html