Sometimes, the deadliest threats are hidden in the most inconspicuous places.

The largest decentralized exchange on the Sui chain has experienced a security incident that can only be described as disastrous—a hacker exploited a code vulnerability to steal 230 million USD from the liquidity pool. The value of this line of code cannot be separated from the cost of 1.6 billion.

The root of the problem is actually very hidden. The hacker triggered a series of chain reactions through carefully designed input parameters: first, they made the condition n <= mask hold true, allowing the execution flow to enter line 23; then, they ensured n ≥ 2^192, so when executing the left shift operation n << 64, the entire value instantly broke through the boundary of u256. As a result, the function outputted a completely unexpected value, granting the hacker the permission to manipulate the assets.

The entire attack process is astonishingly exquisite — it is not a brute force attack, but rather a deep understanding of the protocol boundaries. The hacker seems to have precisely calculated every parameter, as if they found that critical tipping point in a high-precision mathematical game.

Fortunately, the official team has quickly identified and fixed the vulnerability. However, the warning left by this incident remains glaring: in the field of blockchain, even the smallest code defect, when multiplied by a sufficiently large amount of capital, can turn into a financial disaster. For any protocol running on the chain, the importance of code auditing has far exceeded the scope of "best practices"—it is a prerequisite for survival.