There is an invalid free in the MagickFree function in magick/memory.c in GraphicsMagick 1.3.26 that will lead to a denial of service attack. Product bug: https://bugzilla.redhat.com/show_bug.cgi?id=1484196
Created GraphicsMagick tracking bugs for this issue: Affects: epel-all [bug 1488444] Affects: fedora-all [bug 1475495]
as said in the product bug, the issue appear to be in libtiff.
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.