Web3 Security

Reentrancy attacks

Chapter 3 of 10 · Web3 Security 30%

🔁 The bug that forked Ethereum (3.6M ETH gone)

June 2016. The DAO's withdraw function sent ETH before zeroing the balance, and a single recursive call drained 3.6M ETH. The fix is one line. The hard fork that followed split Ethereum in two. 💥

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