Sindhi-language characters can crash iPhones and other iOS/macOS devices if a victim views texts, Twitter posts or messages within various apps containing them. Apple devices are vulnerable to a “text bomb” attack where simply looking at messages or posts containing characters in the Sindhi language can crash devices. Sindhi is an official language used in Pakistan. The bug affects iPhone, iPad, Macs and Apple Watches, and arises from macOS and iOS failing to properly render a Unicode symbol used when writing in the language. Because the symbol confuses the operating systems, according to a Friday post from researcher Graham Cluley at Bitdefender, the devices simply spontaneously crash when it shows up in a viewing window.