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No, its never been hacked.
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Someone used the protocol in a way not intended to create a large amount of bitcoins for themselves.
That's the definition of hacking.
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Was more like an exploit of bug. Not a real hacking.
But yes, is a very good example, you mentioned.
The value overflow incident is probably the only time someone "hacked" Bitcoin.
Between blocks 74638 and 74691 the largest blockchain contained these fake bitcoins.