What are the risks of EIP-7702? There are five main ones: users being tricked into signing malicious delegations, authorizations without a fixed chain ID being replayed on other chains, the original private key remaining a single point of failure that can bypass every rule if leaked, bugs in the delegated contract itself, and older contracts’ assumptions about ordinary addresses no longer holding. EIP-7702 brings the convenience of smart accounts, and it brings these risks to everyday users too.
Why Are Malicious Delegations So Dangerous?
Under EIP-7702, a delegation the user signs makes their address run another contract’s code, and that code has the same authority as the address owner. If the delegate is a contract written by an attacker, every token and NFT at the address can be drained at once, and the delegation stays in effect until the user revokes it. Because signing an authorization looks much like any other signature request, users find it hard to spot the danger. Since the Pectra upgrade, attackers have already used malicious delegations to steal assets at scale.
What Is the Cross-Chain Replay Risk in EIP-7702?
An authorization can specify a chain ID. If the chain ID is set to 0, the authorization is valid on every EVM chain that supports EIP-7702. The same contract address does not necessarily hold the same code on different chains, so an attacker could deploy a malicious contract at that address on another chain, turning an authorization that was safe on one chain into a risk on others.
What Happens If the Private Key Leaks?
EIP-7702 does not replace the original private key. The delegated contract can set limits and whitelists, but whoever holds the key can always sign transactions directly or switch to a different delegate, bypassing every rule. This differs from an ERC-4337 smart account, which can replace its signing key, as covered in how EIP-7702 and ERC-4337 compare. For an EIP-7702 address, protecting the private key is still the foundation of security.
How Does EIP-7702 Affect Smart Contracts and DeFi Protocols?
Many older contracts assume that an address without code belongs to a regular user, or use tx.origin to check whether a call comes from a person, as a defense against reentrancy or bots. After EIP-7702, ordinary addresses can run arbitrary code, so these assumptions are no longer reliable. Bugs in the delegated contract, or storage conflicts when a user switches between delegate contracts, can also lead to losses.
How Can You Reduce the Risks of EIP-7702?
Users and wallets should only delegate to audited, publicly verifiable contracts, fix the chain ID in every authorization, and treat delegation signature requests with caution. Businesses can protect the private key behind each address with MPC to remove the single point of failure, then use an off-chain policy engine to keep a whitelist of trusted delegate contracts and require multi-party approval for any delegation change. Contract developers should revisit any logic that relies on tx.origin or on an address having no code.
Conclusion
The risks of EIP-7702 center on authorization and keys: one wrong authorization or one leaked private key can cost an address everything. Safeheron’s MPC Wallet-as-a-Service provides multi-chain MPC key management and a policy engine for businesses.
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