Upgradeable Proxy Contract Fuzzing

We rigorously test for storage collisions between the proxy and implementation contracts, a primary cause of catastrophic state corruption during upgrades.

Fuzzing validates that initializer functions are correctly protected from reentrancy and that constructor logic is properly migrated for UUPS and Transparent proxies.

We simulate attacks on upgrade mechanisms (e.g., upgradeTo, upgradeToAndCall) to ensure only authorized addresses can execute upgrades under all conditions.

Our fuzzer identifies dangerous collisions between proxy admin functions and implementation functions, preventing unintended overrides and access control bypasses.

We test the integrity of delegatecall execution across upgrades, ensuring context (msg.sender, msg.value) is preserved and storage writes are atomic.

Comprehensive post-upgrade simulation to verify that the new implementation's logic interacts correctly with the existing, migrated contract state.

We systematically fuzz for storage collisions and layout incompatibilities during upgrades, preventing catastrophic data corruption and fund loss. This is a primary failure mode in UUPS and Transparent proxies.

Our fuzzing engines specifically attack initialize(), upgradeTo(), and changeAdmin() functions to uncover privilege escalation paths and reinitialization vulnerabilities before they are exploited.

We rigorously test the integrity of delegatecall execution within the proxy context, identifying edge cases where logic execution deviates from expected behavior, a common source of subtle bugs.