Cross-chain protocol Chainflip was exploited on its TRON USDT integration. The attacker abused TRON memo handling by attaching a custom memo to a transaction already signed by validators, causing the system to treat the same deposit as a separate failed swap and issue a duplicate refund. The attack was repeated eight times over about 90 minutes, producing six unauthorized payouts totaling 736,442.17 USDT. A pending user swap of 115,654.41 USDT remains safely in the vault. The network is paused, a fix is ready, restart is expected as early as Monday, and affected users will be made whole.