Uniswap V4: Hooks Security Considerations

Executive summary: This report assesses Uniswap V4's new hook system and PoolManager integration, warning that customizable hooks introduce significant new attack surface. Key risks include permission-mismatch deployments, malformed return values, missing access controls that allow unauthorized calls, weak input validation enabling fake pools or reentrancy, hook-driven delta attribution that can misassign liabilities, centralization/upgrade risks that enable privileged abuse, and hooks that can permanently trap funds via deliberate reverts; the paper recommends strict validation, restricted permissions, robust access control, and rigorous security reviews prior to deployment.