Incident Overview
n00dleswap was exploited via a reentrancy attack. The attacker took 20 $ETH using a malicious smart contract.
n00dleswap is an NFT DEX on the Ethereum chain. The project's ERC777-based smart contract was hacked via a reentrancy attack. The hacker stole 31,096 $USD worth of $ETH.
All the stolen amount remains at the attacker's original address at the moment.
Attacker address:
https://etherscan.io/address/0x8ca72f46…870ff0
Malicious contract:
https://etherscan.io/address/0x9c5a2a64…789c56
Malicious transaction:
https://etherscan.io/tx/0x8037b3dc…893aea
Incident Report
Protocol Information
What the Attacker Needed to Succeed
Understanding the prerequisites for this type of attack helps auditors identify protocols that are most at risk and helps developers build better defenses.
What Auditors Should Check
If you're auditing a protocol with similar architecture to n00dleswap, these are the critical security checks that could have prevented this incident (October 2022).
- Verify all logic paths related to Reentrancy are guarded by proper access controls and input validation - see the Reentrancy attack class for patterns
- Check that all state-changing functions follow the Checks-Effects-Interactions (CEI) pattern to prevent reentrancy and logic ordering bugs
- Review privileged functions (owner, admin, governance) for potential abuse vectors - centralization risks should be documented and bounded with timelocks or multi-sigs
Master these auditing techniques with hands-on labs and real exploit scenarios in the Smart Contract Hacking course.
Free TrialRelated Attack Classes
The technique used in this hack maps to these vulnerability classes in our security curriculum:
Sources & References
Learn to Prevent the Next n00dleswap
The n00dleswap hack is one of many attacks that skilled auditors are trained to detect before deployment. Master real exploit patterns and defense techniques with hands-on Web3 security training.