What are the most common smart contract vulnerabilities?

Common smart contract vulnerabilities include reentrancy attacks, improper access control, logic errors, unchecked external calls, and oracle manipulation. Many issues result from reused code or insufficient testing. To reduce these risks, teams increasingly adopt secure smart contract development practices and audit-ready architectures. Gas inefficiencies can also impact reliability. Industry professionals, including those at Security Tokenizer, emphasize careful design and testing to minimize vulnerabilities in real-world blockchain applications.