Flow Foundation has confirmed a security breach on December 27, 2025, involving an execution layer vulnerability that allowed attackers to move approximately $3.9 million off-chain. The network was promptly shut down to prevent further exploitation. Importantly, user balances remain unaffected, with all deposits secure. The stolen assets were primarily transferred via cross-chain bridges, and the attacker addresses have been identified and are under surveillance. Freeze requests have been issued to Circle, Tether, and various exchanges to monitor and prevent potential money laundering activities. The network is currently isolated, with a patch undergoing validation. A rollback to a pre-attack state is planned, necessitating the resubmission of legitimate transactions. Flow Foundation assures users that their funds are safe, with further updates to follow.