Smart Contract Audit Checklist 2026

Critical Vulnerabilities

1. Reentrancy

• All external calls guarded by ReentrancyGuard or follow checks-effects-interactions
• Cross-function reentrancy risks identified
• ERC777 / ERC1155 token hooks considered

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2. Access Control

• No tx.origin for authorization (use msg.sender)
• Role-based access for multi-admin systems
• Initialization functions protected from frontrunning

3. Oracle Manipulation

• TWAP oracles used instead of spot price
• Oracle price freshness checks implemented

Medium Severity

4. External Calls

• All .call() return values checked with require()
• Gas limits set on low-level calls

5. Frontrunning / MEV

• Slippage protection in swaps
• Deadline parameters on user transactions

Low Priority

6. Gas Optimization

• Unchecked blocks for for-loop increments
• Events emitted for state changes

7. Code Quality

• Explicit function visibility on all functions
• Unused variables and imports removed

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Related: OWASP Smart Contract Top 10 2026 — complete vulnerability ranking with real 2025 loss data