Dev Tools · 1h ago
Proxy Contract Storage Collisions: A Silent State Corruption Bug
Upgradeable smart contracts in DeFi use proxies that delegate storage to the implementation. If developers reorder or insert state variables during upgrades, storage slots misalign, corrupting data silently. The fix is strict discipline: never reorder, change types, or delete variables; only append new ones at the end.
Meridian48 take
This is a well-known but often overlooked Solidity pitfall—worth a read for any developer working with upgradeable contracts, though the patterns described are standard practice in audited codebases.
Read the full reporting
Proxy Contracts and Storage Collisions: The Upgrade That Corrupts Your State →
DEV Community
soliditysmart-contracts