A heap-based-buffer-over-read flaw was found in ImageMagick's GetPixelAlpha() function of 'pixel-accessor.h'. This vulnerability is triggered when an attacker passes a specially crafted Tagged Image File Format (TIFF) image to convert it into a PICON file format. This issue can potentially lead to a denial of service and information disclosure.
https://github.com/ImageMagick/ImageMagick/issues/4729
https://github.com/ImageMagick/ImageMagick/commit/e50f19fd73c792ebe912df8ab83aa51a243a3da7