The DrawDashPolygon function in MagickCore/draw.c in ImageMagick before 6.9.4-0 and 7.x before 7.0.1-2 mishandles calculations of certain vertices integer data, which allows remote attackers to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impact via a crafted file.
https://github.com/ImageMagick/ImageMagick/commit/726812fa2fa7ce16bcf58f6e115f65427a1c0950
http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html