In ImageMagick 7.0.9-7 Q16, there is a use-after-free in the function MngInfoDiscardObject of coders/png.c, related to ReadOneMNGImage.
Created ImageMagick tracking bugs for this issue:
Affects: epel-8 [bug 1792470]
Affects: fedora-all [bug 1792469]
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):