The bug that causes iPhones to crash when they receive a boobytrapped text
message also affects the Apple Watch, iPads and Macs.
The crash is caused by a bug within a core system common to all of Apple’s
devices that handles text. When presented with non-Latin characters in a
specific sequence - including those from Arabic, Chinese and Marathi - the
CoreText system chokes, causing it to fail and bring the entire operating
system to a halt.
