The ReadSCREENSHOTImage function in coders/screenshot.c in ImageMagick before 7.0.6-1 has memory leaks, causing denial of service.
https://github.com/ImageMagick/ImageMagick/issues/556
https://github.com/ImageMagick/ImageMagick/commit/72a50e400d98d7a2fd610caedfeb9af043dc5582