In 2015, there was a lot of fuss about a bug called Effective Power which is a series of characters that can cause iOS to crash. Now, we have something similar but it is only one character and it’s causing different iOS messaging apps to shut down. The character is in the Telugu language, a Central-Southern Dravidian language spoken in India by about 70 million people. When this character is received or pasted into a text field, it leads to a freeze of apps or a complete crash of the entire operating system. iMessage, Facebook Messenger, WhatsApp, Gmail, and Outlook have all crashed when this symbol is used.
The most recent iPhone bug (CVE-2018-4124) has been wreaking havoc due to unexpected behavior when the operating system attempts to display a particular Indian character from the Telugu language. A unique text character is causing iPhones to crash, but there's an easy fix to stop it from happening. It involves messaging someone with a very specific character in the Indian language Telugu.
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You can take a look at for some projects we've open sourced. When converting the Telugu character to HTML entities, it is broken up into 5 different unicode characters. However, one of those characters is : a zero-width non-joiner. This is the cause of the crash. Now, to clarify: the ZWNJ does nothing by itself.
If you try using another Telugu character with the ZWNJ in it, iOS won't crash. This specific combination is (afaik) the only one which leads to a crash. There is a safe version of the character: one that doesn't have the ZWNJ. They are entirely identical- the ZWNJ is not visible. For those interested, the HTML equivalent of the safe character is జ్ఞా 1 I used this ^ site to get the HTML equivalent. Your comment has been automatically removed because it contains a link shortener. Could I ask you to repost this using the actual URL rather than the link shortener?
Reddit's spam filter dislikes link shorteners and it is generally recommended that you do not use them. Not using them is best because it prevents the problem of 'dangerous clicks' and users will always know exactly what they'll be clicking on before being redirected.
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