Protocol Upgrade Compatibility Review: Maple

Target Protocol: Maple (TVL: $3004.1M)

Security & Audit Report: Protocol Upgrade Compatibility Review (Maple Finance Architecture)

Target: Maple Finance (Upgrade Compatibility & Smart Contract Security)

Scope: Smart Contract Upgradeability, Storage Layout Continuity, Access Controls, and EVM State Migration

Auditor: Senior DeFi Security Researcher

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1. Executive Summary

This security review evaluates the upgrade compatibility mechanics for the Maple Finance protocol architecture. Upgradeable smart contract systems relying on proxy patterns (e.g., Transparent Proxy or UUPS / EIP-1967) present unique attack surfaces related to EVM state persistence, storage slot layout, initialization vectors, and cross-chain/L2 deployment synchronization.

The objective of this review is to identify potential failure modes, storage collision risks, and authorization vulnerabilities associated with logic contract transitions, ensuring that upgrades do not compromise protocol TVL or operational integrity.

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2. Identified Attack Vectors

AV-01: Storage Layout Collisions (Unstructured vs. Structured Storage)

• Mechanism: Modifying, reordering, or inserting state variables in a new implementation contract can shift storage slots relative to the proxy's storage layout.
• Impact: Corrupts critical contract state (e.g., pool balances, collateral ratios, debt records, or owner addresses), potentially resulting in immediate loss of funds or permanent protocol bricking.
• Context: Common when inheriting from multiple base contracts or adding new state variables without leveraging append-only patterns or designated storage gap arrays (uint256[50] __gap).

AV-02: Uninitialized Logic/Implementation Contracts

• Mechanism: Proxy contracts delegate calls (delegatecall) to logic implementation contracts. If the implementation contract itself is left uninitialized (initialize() function not invoked on the

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