The exploit hit a custody bridge AFX operates rather than the Arbitrum network itself, with the stolen funds quickly moved to Ethereum.

Arbitrum's native bridge was not hacked. A $24M exploit drained Ostium DEX via a compromised oracle key, causing a 4% ARB decline and raising

PeckShield flagged that the attacker bridged the stolen funds from Arbitrum to Ethereum and swapped them for 12,467 ETH.