In FreeBSD 12.1-STABLE before r362281, 11.4-STABLE before r362281, and 11.4-RELEASE before p1, long values in the user-controlled PATH environment variable cause posix_spawnp to write beyond the end of the heap allocated stack possibly leading to arbitrary code execution.
https://security.netapp.com/advisory/ntap-20200724-0002/
https://security.FreeBSD.org/advisories/FreeBSD-SA-20:18.posix_spawnp.asc