Brothers Anton and James Peraire-Bueno exploited a vulnerability in MEV-Boost, a software used by 90% of Ethereum validators, to access and manipulate transactions.

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Brothers Anton and James Peraire-Bueno exploited a vulnerability in MEV-Boost, a software used by 90% of Ethereum validators, to access and manipulate transactions.

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The exploit happened thanks to a vulnerability that the brothers discovered in MEV-boost, a piece of software used by roughly 90% of the validators that run the blockchain, allowing them to see the transactions in blocks before they were officially sent off to validators.
MEV, or maximal extractable value, is sometimes known as an 'invisible tax' that validators and builders can collect from users by reordering or inserting transactions in a block before they’re added to the blockchain.

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Technical specifics of how the ethereum attack by two brothers Anton and James Peraire-Bueno was executed