sudo-1.8.14p2
FreeBSD 10.1-STABLE #0 r279493

The problem surfaced from nrpe and cciss_vol_status

Downgrade to 1.8.13 fixed it, did not try any version in between.

Here is the debug output from sudo when it tries to call
sudo /usr/local/bin/cciss_vol_status /dev/ciss0
from nrpe

Jul 22 16:43:01 sudo[30521] -> sudo_check_suid @ ./sudo.c:776
Jul 22 16:43:01 sudo[30521] <- sudo_check_suid @ ./sudo.c:820
Jul 22 16:43:01 sudo[30521] -> save_signals @ ./signal.c:64
Jul 22 16:43:01 sudo[30521] <- save_signals @ ./signal.c:71
Jul 22 16:43:01 sudo[30521] -> sudo_conf_read_v1 @ ./sudo_conf.c:537
Jul 22 16:43:01 sudo[30521] -> sudo_secure_path @ ./secure_path.c:43
Jul 22 16:43:01 sudo[30521] <- sudo_secure_path @ ./secure_path.c:62 := 0
Jul 22 16:43:01 sudo[30521] -> sudo_parseln_v1 @ ./parseln.c:55
Jul 22 16:43:01 sudo[30521] <- sudo_parseln_v1 @ ./parseln.c:118 := 40
Jul 22 16:43:01 sudo[30521] -> sudo_parseln_v1 @ ./parseln.c:55
Jul 22 16:43:01 sudo[30521] <- sudo_parseln_v1 @ ./parseln.c:117 := 18446744073709551615
Jul 22 16:43:01 sudo[30521] <- sudo_conf_read_v1 @ ./sudo_conf.c:626 := 1
Jul 22 16:43:01 sudo[30521] -> get_user_info @ ./sudo.c:455
Jul 22 16:43:01 sudo[30521] -> sudo_new_key_val_v1 @ ./key_val.c:44
Jul 22 16:43:01 sudo[30521] <- sudo_new_key_val_v1 @ ./key_val.c:56 := user=nagios
Jul 22 16:43:01 sudo[30521] -> get_user_groups @ ./sudo.c:394
Jul 22 16:43:01 sudo[30521] <- get_user_groups @ ./sudo.c:440 := groups=181
Jul 22 16:43:01 sudo[30521] -> sudo_new_key_val_v1 @ ./key_val.c:44
Jul 22 16:43:01 sudo[30521] <- sudo_new_key_val_v1 @ ./key_val.c:56 := cwd=/
Jul 22 16:43:01 sudo[30521] -> get_process_ttyname @ ./ttyname.c:387
Jul 22 16:43:01 sudo[30521] <- get_process_ttyname @ ./ttyname.c:425 := (null)
Jul 22 16:43:01 sudo[30521] <- get_user_info @ ./sudo.c:559 := 0x0
Jul 22 16:43:01 sudo[30521] main: unable to allocate memory @ main() ./sudo.c:182