A buffer overflow vulnerability in FloydSteinbergDitheringC() in contrib/gdevbjca.c of Artifex Software GhostScript v9.50 allows a remote attacker to cause a denial of service via a crafted PDF file. This is fixed in v9.51.
https://lists.debian.org/debian-lts-announce/2020/08/msg00032.html
https://security.gentoo.org/glsa/202008-20