Smart Contract Security Audits: Reentrancy, Flash Loans, and Formal Verification
An architectural guide to smart contract vulnerabilities: reentrancy attacks, oracle manipulation, integer overflows, and audit reports.
Learn how top audit firms inspect Solidity and Rust bytecode for logic flaws, static analysis with Slither, and unit testing invariants.
1. The Classic Reentrancy Vulnerability
Reentrancy occurs when an external smart contract call is made before internal state balances are updated. The famous 2016 DAO hack drained 3.6 million ETH using this exact vulnerability.
Modern developers follow the Checks-Effects-Interactions pattern or OpenZeppelin's ReentrancyGuard mutex to ensure state updates precede external token transfers.
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