Smart Contract Security Glossary

Definitions, examples, and audit checks for Solidity, EVM, and DeFi security terms.

All 63 Vulnerabilities 7 EVM 7 Solidity 23 DeFi 15 Testing 3 Audit Tools 1 Standards 7

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Standards

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ERC-4626 Vaults

ERC-4626 is the tokenized vault standard where users deposit an asset and receive vault shares that represent a claim on the vault's assets.

EIP-712

EIP-712 is a standard for signing typed structured data so a signature is bound to a specific message type and domain.

Permit2

Permit2 is Uniswap's shared approval and signature transfer system that lets users authorize token spends through structured signatures or managed allowances.

Token Decimals

Token decimals are ERC-20 metadata that describe how raw integer balances should be displayed, not a guarantee that every token uses 18 decimals.

Non-Standard ERC-20

A non-standard ERC-20 is a token that behaves differently from common ERC-20 assumptions, such as missing return values, fees, rebases, pauses, blacklists, or unusual decimals.

SafeERC20

SafeERC20 is an OpenZeppelin library that wraps ERC-20 calls to handle tokens that revert, return false, or return no value.

ERC-777 Hooks

ERC-777 hooks are callback functions that can run during token transfers, giving sender or recipient contracts a chance to execute code.