In Artifex Ghostscript before 9.24, attackers able to supply crafted PostScript files could use incorrect free logic in pagedevice replacement to crash the interpreter.
git.ghostscript.com/?p=ghostpdl.git%3Ba=commit%3Bh=241d91112771a6104de10b3948c3f350d6690c1d
access.redhat.com/errata/RHSA-2018:3834
bugs.ghostscript.com/show_bug.cgi?id=699664
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