Arcus Exploit: How a $2.23M Subaccount Accounting Bug Worked and What Users Should Check
Perp DEX Arcus lost 2,234,391 USDG on November 9, 2026 when a bug in transfers between a user's own subaccounts let one new account record a far larger balance than it held. Arcus says user balances were not affected and its treasury covered the loss. Here is the timeline and a practical checklist.
