https://www.cnet.com/news/apple-updates-operating-systems-to-fix-app-crashing-bug/

Apple released security updates for its operating systems on Monday to address a bug that caused apps to crash when a certain Indian symbol is displayed.

The bug, discovered last week, allowed the Indian character in the Telugu language to shut down iOS apps and prevent them from opening back up. The bug affected any app that can display characters, including Twitter, Facebook, Instagram and Messages.