Smart Contract Security
Over $3.8 billion has been lost to smart contract exploits. Learn about vulnerabilities, how to prevent them, and how to audit your code.
$3.8B+
Total Losses
500+
Documented Hacks
30+
Vulnerability Types
20+
Security Tools
Vulnerabilities
Learn about common smart contract vulnerabilities, how they work, and how to prevent them.
Auditing Guide
Step-by-step guide to auditing smart contracts, including methodology and tools.
Incident Database
Database of past hacks and exploits with detailed post-mortems and lessons learned.
Security Tools
Comprehensive list of security tools for static analysis, fuzzing, and formal verification.
Recent Incidents
View all →Euler Finance
Mar 2023Flash Loan
$197M
Lost
Ronin Bridge
Mar 2022Compromised Keys
$625M
Lost
Wormhole
Feb 2022Signature Verification
$326M
Lost
Cream Finance
Oct 2021Oracle Manipulation
$130M
Lost
Vulnerability Distribution
Based on analysis of 500+ documented exploits
Quick Security Checklist
Essential security checks before deploying any smart contract
Access Control
- ✓ Use OpenZeppelin's Ownable/AccessControl
- ✓ Check function visibility (public/external)
- ✓ Implement role-based permissions
- ✓ Add emergency pause functionality
Reentrancy Protection
- ✓ Use Checks-Effects-Interactions pattern
- ✓ Implement ReentrancyGuard
- ✓ Avoid state changes after external calls
- ✓ Use pull over push for payments
External Calls
- ✓ Validate return values
- ✓ Handle oracle failures gracefully
- ✓ Use TWAP for price feeds
- ✓ Implement circuit breakers
Secure Your Smart Contracts
Use GetChainLens to automatically detect vulnerabilities before deployment.