A flaw was found in ghostscript. The fix for CVE-2020-16305 in ghostscript was not included in RHSA-2021:1852-06 advisory as it was claimed to be. This issue only affects the ghostscript package as shipped with Red Hat Enterprise Linux 8.
https://bugzilla.redhat.com/show_bug.cgi?id=2228151
https://bugzilla.redhat.com/show_bug.cgi?id=1870257