Reentrancy Attack Risk

Reentrancy attack risk is a specific smart contract vulnerability where an attacker repeatedly calls a function before the previous execution has finished, allowing them to withdraw funds multiple times. This occurs when a contract makes an external call to an untrusted contract before updating its own internal state.

It is one of the most famous and damaging exploits in the history of Ethereum-based protocols. Preventing this requires careful coding practices, such as using mutex locks or ensuring state changes occur before external interactions.

It is a primary focus of smart contract security audits. Understanding this risk is fundamental for developers and auditors working in the decentralized finance space.