In Artifex Ghostscript before 9.24, attackers able to supply crafted PostScript files could use a type confusion in the setcolor function to crash the interpreter or possibly have unspecified other impact.
https://www.debian.org/security/2018/dsa-4288
https://www.artifex.com/news/ghostscript-security-resolved/
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=699655
http://git.ghostscript.com/?p=ghostpdl.git%3Ba=commit%3Bh=b326a71659b7837d3acde954b18bda1a6f5e9498