Artifex Ghostscript is vulnerable to arbitrary code execution. This is because artifex ghoscript allows an user-writable error exception table. An attacker could use this flaw to supply crafted PostScript to potentially overwrite or replace error handlers to inject code.
git.ghostscript.com/?p=ghostpdl.git;a=commit;h=fb713b3818b52d8a6cf62c951eba2e1795ff9624
access.redhat.com/errata/RHSA-2018:3834
access.redhat.com/security/updates/classification/#important
bugs.ghostscript.com/show_bug.cgi?id=699708
bugzilla.redhat.com/show_bug.cgi?id=1657822
lists.debian.org/debian-lts-announce/2018/09/msg00038.html
usn.ubuntu.com/3773-1/