The bug itself involves sending an Indian language (Telugu) character to devices, and Apple's iOS Springboard will crash once the message has been received.
These features were expected in the already released iOS 11 update but were reportedly delayed because Apple wanted to upgrade its own process of developing apps and the way they are introduced to the world.
Basically any app where you can input text is affected by this bug.
Once the problematic message has been received, iOS will crash and any attempts to re-open the app containing the message will typically be met with failure. Developers will also have to build new iOS apps with iOS 11 SDK or later, and construct new Apple Watch apps with watchOS 4 SDK or later.
The seemingly endless string of iOS bugs is a sickness that just won't go away.
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Apple is aware of the problem - as testing the issue in beta versions of iOS 11.3 did not have the same issue.
"For the avoidance of doubt, we strongly suggest that you do not try to replicate the bug on your devices or send it to your contacts", author Giuseppe Tripodi wrote.
As Engadget lays out, the issue is simply that apps can't figure out how to load the character, which overwhelms them and forces them to shut down. The app the message was sent to also shuts down and fails every time you try to open it.
If you can't wait to speak in Telugu until then, there's a manual workaround for the bug to keep you going.
The ChaiOS hack, revealed in January 2018, causes devices to crash and can delete all your messages, affects any device running iOS and Mac OS.