Smart Contract Security: A Taxonomy of Vulnerabilities, Attacks, and Defenses

This story was originally published on HackerNoon at: https://hackernoon.com/smart-contract-security-a-taxonomy-of-vulnerabilities-attacks-and-defenses. A practical taxonomy of smart contract vulnerabilities, covering reentrancy, integer overflow, access control, MEV, invariant violations, and key defense strate Check more stories related to web3 at: https://hackernoon.com/c/web3. You can also check exclusive content about #smart-contract-security, #smart-contracts, #ethereum, #solidity-vulnerabilities, #reentrancy-attack, #flash-loan-exploits, #smart-contract-auditing, #hackernoon-top-story, and more. This story was written by: @kamronbek. Learn more about this writer by checking @kamronbek's about page, and for more stories, please visit hackernoon.com. Smart contracts are immutable once deployed. A single bug can drain millions in minutes. This article builds a practical taxonomy of the most dangerous vulnerability classes: reentrancy, integer overflow, access control, MEV, and invariant violations. Each section explains the vulnerability with Solidity code, formal notation, and systematic defenses.