Here are three specific DeFi smart contract vulnerabilities, formatted for inclusion in a professional security audit report. Each entry includes the vulnerability description, root cause, potential impact, and recommended remediation.
1. Reentrancy Attack in Token Transfer Callbacks
Vulnerability ID: VULN-001
Severity: Critical
Location: TokenSwap.sol:142–168 – swapExactTokensForTokens()
Description:
The swapExactTokensForTokens() function allows users to receive a callback via the onERC721Received-style pattern (or direct call) after transferring tokens but before updating the internal accounting state (e.g., user balances or liquidity pool reserves). An attacker can deploy a malicious token contract that, upon receiving the transfer, immediately re-enters the swapExactTokensForTokens() function. Since the internal state has not yet been updated to
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