An issue was discovered in Artifex Ghostscript before 9.24. A type confusion in "ztype" could be used by remote attackers able to supply crafted PostScript 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://security.gentoo.org/glsa/201811-12
https://lists.debian.org/debian-lts-announce/2018/09/msg00015.html
https://bugs.ghostscript.com/show_bug.cgi?id=699659
https://access.redhat.com/errata/RHSA-2018:3650
http://seclists.org/oss-sec/2018/q3/182
http://git.ghostscript.com/?p=ghostpdl.git%3Ba=commit%3Bh=0edd3d6c634a577db261615a9dc2719bca7f6e01