Ethereum developer warns of potential block auction attack on Sepolia testnet

An Ethereum developer has warned that attackers could exploit free testnet ETH and disposable builder identities to win Sepolia block auctions and withhold transaction payloads during the Glamsterdam testing phase. While the attack does not threaten mainnet funds, it could disrupt infrastructure testing. The Sepolia public test is scheduled for October 6, with Hoodi testing tentatively set for October 27.