A critical vulnerability in the Aptos blockchain, which could have endangered up to $70 billion in digital assets, has been identified and fixed by the Aptos team. Discovered by white-hat hackers from security firm Hexens, the flaw was found in the Move virtual machine, the execution environment for on-chain smart contracts. The vulnerability, known as a "stale cache vulnerability," could have led to a type confusion bug, allowing attackers to misinterpret on-chain resources. Hexens researchers reported the issue in late February and demonstrated a successful attack simulation with over 90% success rate using a network of servers costing only $3,000. The attack did not require insider access or special privileges. The Aptos team promptly addressed the vulnerability, ensuring no funds were lost.