In GraphicsMagick 1.4 snapshot-20190322 Q8, there is a heap-based buffer over-read in the ReadMNGImage function of coders/png.c, which allows attackers to cause a denial of service or information disclosure via an image colormap.
Created GraphicsMagick tracking bugs for this issue:
Affects: epel-all [bug 1699928]
Affects: fedora-all [bug 1699929]
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.