DeFi Smart Contract Vulnerabilities Audit Guide

Here are three high-severity DeFi smart contract vulnerabilities, described with the specificity required for a professional security audit report. Each includes the vulnerability type, technical mechanism, potential impact, and a recommended mitigation strategy.

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1. Reentrancy Attack in Cross-Protocol Yield Aggregator

Vulnerability Type: Cross-Function Reentrancy

Severity: High

Affected Component: YieldAggregator.sol → deposit() and withdraw() functions

Technical Description:

The contract interacts with two external protocols: Protocol A (a lending market) and Protocol B (a staking pool). The deposit() function executes the following sequence:

1. User sends ETH to the aggregator.
2. Aggregator calls ProtocolA.deposit(ethAmount).
3. Aggregator calls ProtocolB.stake(tokensReceived).
4. aggregatorBalances[user] += tokensReceived is updated after the