The AcquireCacheNexus function in magick/pixel_cache.c in GraphicsMagick before 1.3.28 allows remote attackers to cause a denial of service (heap overwrite) or possibly have unspecified other impact via a crafted image file, because a pixel staging area is not used.
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"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-6799.json"