Smart Contracts Security: Common Vulnerabilities

Learn the most common smart contract bugs before they cost you.

Reentrancy Attacks

Understand the DAO hack pattern and use checks-effects-interactions.

Integer Overflow/Underflow

Solidity 0.8+ prevents this, but know the history and SafeMath.

Access Control Bugs

Protect admin functions with proper modifiers and role-based access.

Audit Checklist

Review external calls, gas limits, front-running, and oracle manipulation.