Web3 Daily Exploits β 29 Oct 2026: zkLink Nova ~$0.78M Arbitrator Forged Batch Root
zkLink Nova Arbitrator on Ethereum (and Optimism) lost ~$780-805K after the claim path failed to clear transient finalizeMessageHash, allowing a public relayer to install an attacker-chosen L2 logs root and finalize forged withdrawals. Live loss ~$0.78M, 1 incident, ETH Β· OP. Avalanche Tranche remains an UPDATE.

