A new Unicode text bug is being spread around today, popularised by a video by EverythingApplePro. It’s being called the ‘black dot’ bug because of its origins on Android as a bug relating to WhatsApp: it was being spread with the following emoji: <⚫> 👈🏻. The iOS version of this bug is a bit different in its mechanics, but neither variants actually rely on the visible black dot character to cause the freezes and crashes.
The secret is that the strings contain thousands of hidden invisible Unicode characters, which churns through CPU cycles as the system attempts to process them. If this specially crafted text is sent through Messages, it will result in repeated crashes when the recipient tries to read it.
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