In Artifex Ghostscript before 9.24, attackers able to supply crafted PostScript files could use a type confusion in the LockDistillerParams parameter to crash the interpreter or execute code.
https://access.redhat.com/errata/RHSA-2018:2918
https://lists.debian.org/debian-lts-announce/2018/09/msg00015.html
https://security.gentoo.org/glsa/201811-12
https://support.f5.com/csp/article/K22141757?utm_source=f5support&%3Butm_medium=RSS
https://usn.ubuntu.com/3768-1/