OpenDoas through 6.8.2, when TIOCSTI is available, allows privilege escalation because of sharing a terminal with the original session. NOTE: TIOCSTI is unavailable in OpenBSD 6.0 and later, and can be made unavailable in the Linux kernel 6.2 and later.

In OpenDoas from 6.6 to 6.8 the users PATH variable was incorrectly inherited by authenticated executions if the authenticating rule allowed the user to execute any command. Rules that only allowed to authenticated user to execute specific commands were not affected by this issue.