maidag in GNU Mailutils before 3.8 is installed setuid and allows local privilege escalation in the url mode.
https://security.gentoo.org/glsa/202006-12
https://git.savannah.gnu.org/cgit/mailutils.git/tree/NEWS
http://packetstormsecurity.com/files/155425/GNU-Mailutils-3.7-Privilege-Escalation.html