A flaw in the way Apple software handles images allows hackers to take over an iPhone, iPad, Apple Watch, Mac or Apple TV with a simple iMessage or email. The vulnerability in Apple’s picture-handling Image I/O API means that a malicious Tagged Image File Format (TIFF) file can force a so-called buffer overflow, which allows a hacker to break through Apple’s security and run their own code on a device.

Source: iOS flaw lets hackers access iPhones using an iMessage