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Headline is misleading. Creation of wrapped ETH tokens on Optimism, thereby allowing _theft_ of ETH from contract escrowed funds.

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Thanks. As somebody with a very basic understanding of ETH, it seemed super unlikely that a L2 would be able to able to mint arbitrary ETH. (That would obviously be vulnerability in the L1)

Right, this kind of exploit is in vogue right now.

Minting supply inflation bugs happen all the time, but not usually for something redeemable for something so liquid and valuable.

The bridges are a new unique target.

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