Re-Entrancy Vulnerability Testing

Re-entrancy vulnerability testing is a security procedure designed to find flaws where a contract calls an external address before updating its internal state. This can allow an attacker to recursively call the contract and drain its funds before the first transaction completes.

In the context of derivatives, this is a catastrophic risk for margin and vault contracts. Testing involves writing exploit scripts that attempt to re-enter the contract during execution to verify that re-entrancy guards are working correctly.

It is one of the most critical steps in the smart contract development lifecycle. Protecting against this is non-negotiable for any secure financial protocol.