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Balancer V2 really messed up this time.
On November 3rd, hackers directly breached the vault—at first, everyone thought the loss was "only" 70 million USD, but as on-chain data continued to refresh, the final figure settled at 128 million USD. Even more outrageous, 27 forked protocols that used Balancer's code also suffered, making this chain reaction a classic case of "one person gets sick, the whole family takes medicine."
This incident has sounded the alarm for the entire DeFi circle: code reuse is indeed convenient, but vulnerabilities can also come with "batch inheritance"; no matter how advanced the protocol is, security audits cannot just be a formality; more importantly, decentralization does not mean that there is no oversight, and there must be emergency mechanisms in place when crucial moments arise.
An attack, three lessons, the cost is a bit heavy.