Bug in CoreText allows a string of characters to crash apps

A serious bug has been uncovered in Apple's CoreText layout engine, which is responsible for laying out text in applications which make use of the Cocoa framework on OS X and iOS systems. The bug causes any app relying on CoreText to crash when a specific string of Arabic characters is displayed, meaning just the simple act of viewing a tweet or receiving an instant message is enough to trigger the crash. With apps like messaging or email clients, the problem is more severe, as the app may continue to crash repeatedly if it attempts to display previous message history or previews of email content.


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