5 Smart Contract Vulnerabilities Every Developer Should Know in 2026

📰 Dev.to · Ahmed Moussa

Learn about 5 smart contract vulnerabilities to secure DeFi protocols and protect $90 billion in total value locked

intermediate Published 28 May 2026

Action Steps

Identify Reentrancy vulnerabilities using tools like Etherscan and Mythril
Implement proper access control to prevent Unprotected Function vulnerabilities
Use secure coding practices to avoid Unvalidated Inputs vulnerabilities
Test for Front-Running vulnerabilities using simulation tools like Ganache
Analyze smart contract code for Timejacking vulnerabilities using static analysis tools like Slither

Who Needs to Know This

Developers and security auditors working on DeFi protocols and smart contracts will benefit from understanding these vulnerabilities to ensure the security of their applications

Key Insight

💡 Smart contract security is crucial to protect billions of dollars in DeFi protocols