GhostScript is vulnerable to null pointer dereference. A remote attacker could cause a system hang using the vulnerable compose_group_nonknockout_nonblend_isolated_allmask_common()
function in base/gxblend.c
via a crafted PDF file.
bugs.ghostscript.com/show_bug.cgi?id=701795
git.ghostscript.com/?p=ghostpdl.git;a=commit;h=7870f4951bcc6a153f317e3439e14d0e929fd231
lists.debian.org/debian-lts-announce/2020/08/msg00032.html
security-tracker.debian.org/tracker/CVE-2020-16293
security.gentoo.org/glsa/202008-20
usn.ubuntu.com/4469-1/
www.debian.org/security/2020/dsa-4748