blockchains-security-toolkit/Smart-Contract-Security/reentrancy-notes.md

Reentrancy

• When a contract calls an external function, that external function may itself call the calling function.
• To prevent this attack, a contract can implement a lock in storage that prevents re-entrant calls.

References to learn about reentrancy

• Solidity docs
• DASP
• SWC
• Not so smart contract