In ImageMagick 7.0.7-4 Q16, an out of bounds read flaw related to ReadTIFFImage has been reported in coders/tiff.c. An attacker could possibly exploit this flaw to disclose potentially sensitive memory or cause an application crash.
https://www.debian.org/security/2017/dsa-4040
https://www.debian.org/security/2017/dsa-4032
https://usn.ubuntu.com/3681-1/