An issue was discovered in ImageMagick 6.9.7. Incorrect TGA files could trigger assertion failures, thus leading to DoS.
https://github.com/ImageMagick/ImageMagick/pull/359
https://github.com/ImageMagick/ImageMagick/commit/65f75a32a93ae4044c528a987a68366ecd4b46b9
https://bugs.debian.org/856878