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://www.kb.cert.org/vuls/id/332928
https://www.debian.org/security/2018/dsa-4288
https://usn.ubuntu.com/3768-1/
https://support.f5.com/csp/article/K22141757?utm_source=f5support&%3Butm_medium=RSS
https://security.gentoo.org/glsa/201811-12
https://lists.debian.org/debian-lts-announce/2018/09/msg00015.html
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44101
https://bugs.ghostscript.com/show_bug.cgi?id=699656
https://access.redhat.com/errata/RHSA-2018:2918
http://www.securityfocus.com/bid/105122
http://git.ghostscript.com/?p=ghostpdl.git%3Ba=commit%3Bh=c3476dde7743761a4e1d39a631716199b696b880