The Ins_JMPR function in base/ttinterp.c in Artifex Ghostscript GhostXPS 9.21 allows remote attackers to cause a denial of service (heap-based buffer over-read and application crash) or possibly have unspecified other impact via a crafted document.
https://security.gentoo.org/glsa/201811-12
http://www.securityfocus.com/bid/99987
http://www.debian.org/security/2017/dsa-3986
http://git.ghostscript.com/?p=ghostpdl.git%3Ba=commit%3Bh=c501a58f8d5650c8ba21d447c0d6f07eafcb0f15