The WPG parser in ImageMagick before 6.9.4-4 and 7.x before 7.0.1-5, when a memory limit is set, allows remote attackers to have unspecified impact via vectors related to the SetImageExtent return-value check, which trigger (1) a heap-based buffer overflow in the SetPixelIndex function or an invalid write operation in the (2) ScaleCharToQuantum or (3) SetPixelIndex functions.
https://github.com/ImageMagick/ImageMagick/commits/7.0.1-5
https://github.com/ImageMagick/ImageMagick/commits/6.9.4-4
https://github.com/ImageMagick/ImageMagick/commit/fc43974d34318c834fbf78570ca1a3764ed8c7d7
https://github.com/ImageMagick/ImageMagick/commit/aecd0ada163a4d6c769cec178955d5f3e9316f2f
http://www.securityfocus.com/bid/91283
http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html