Define ‘Front-Running’ in the Context of DeFi and Oracle Feeds

Front-running is a malicious practice where an actor observes a pending transaction (like a large trade or a liquidation trigger from an Oracle) in the public transaction pool (mempool). They then submit their own transaction with a higher gas fee to ensure it is processed first.

This allows them to profit from the price movement caused by the original transaction, often by exploiting a stale Oracle price.