It was discovered that the upstream fix for this issue was not complete. There is still a memory allocation failure in memory.c
Created ImageMagick tracking bugs for this issue:
Affects: fedora-all [bug 1381145]
Basically lowers map_length from 32 (fix for CVE-2016-8862) to the new value 22. Even without the previous fix, this flaw affects ImageMagick shipped with Red Hat Enterprise Linux, hence marking as affected.