ImageIO in Apple iOS before 9.3.3, OS X before 10.11.6, tvOS before 9.2.2, and watchOS before 2.2.2 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted TIFF file.
Apple Security Advisory 2016-07-18-3 - watchOS 2.2.2 is now available and addresses code execution, denial of service, and various other vulnerabilities.