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Yearn Finance yETH Pool Exploited for $9M via Mint Bug

⚠️ A vulnerability in Yearn Finance's yETH pool allowed an attacker to mint an enormous amount of yETH and drain approximately $9 million in assets. Check Point Research (CPR) found that a desynchronization between the pool's main supply counter and its cached virtual balances (packed_vbs[]) enabled the exploit. The attacker used flash loans and repeated deposit/withdraw cycles to pollute cached balances, burned LP tokens to reset supply to zero, then deposited 16 wei to trigger faulty "first deposit" logic and mint inflated tokens, later converting stolen LSD assets to ETH and laundering funds.