Ghostscript is vulnerable to denial of service (DoS) attacks. This is because the .type operator does not properly validate its operands. A remote attacker could supply crafted PostScript to crash the interpreter impacting the availability.
git.ghostscript.com/?p=ghostpdl.git;a=commit;h=0edd3d6c634a577db261615a9dc2719bca7f6e01
seclists.org/oss-sec/2018/q3/182
access.redhat.com/errata/RHSA-2018:3650
access.redhat.com/security/updates/classification/#important
bugs.ghostscript.com/show_bug.cgi?id=699659
lists.debian.org/debian-lts-announce/2018/09/msg00015.html
security.gentoo.org/glsa/201811-12
usn.ubuntu.com/3768-1/
www.artifex.com/news/ghostscript-security-resolved/
www.debian.org/security/2018/dsa-4288