An issue in Pure Data 0.54-0 and fixed in 0.54-1 allows a local attacker to escalate privileges via the set*id () function.
https://github.com/pure-data/pure-data/issues/2063
https://github.com/pure-data/pure-data/commit/0b5e467b8728b3ed56e1a8ee5b367ce78e7e6e5d