A null pointer dereference vulnerability in compose_group_nonknockout_nonblend_isolated_allmask_common() in base/gxblend.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. CREATE(Triage):(User=admin) [CVE-2020-16293|https://nvd.nist.gov/vuln/detail/CVE-2020-16293]