Uniswap V4's hooks enhance DeFi security by mitigating flash loan attacks. These customizable smart contracts allow developers to integrate advanced logic into liquidity pools. The Truncated Oracle hook, for instance, counters price manipulation by capping per-block price movements, unlike traditional TWAP oracles that are vulnerable to sudden spikes. By limiting extreme price swings, it ensures stable collateral valuations, preventing unfair liquidations. Hooks also enable dynamic fee adjustments and access control, reducing the risk of exploits. For example, they can detect and mitigate abnormal trading patterns often associated with flash loans. While not foolproof, these mechanisms significantly bolster Uniswap V4’s resilience against manipulation, offering developers tools to safeguard protocols and maintain market integrity in decentralized finance.