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Exploits NSKeyedUnarchiver SGBigUTF8String Decoding Information Leak

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NSKeyedUnarchiver suffers from an information leak when decoding the SGBigUTF8String class using [SGBigUTF8String initWithCoder:]. This class initializes the string using [SGBigUTF8String initWithUTF8DataNullTerminated:] even though there is no guarantee the bytes provided to the decoder are null terminated. It should use [SGBigUTF8String initWithUTF8Data:] instead.

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