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.
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"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-11007.json"