Ethereum’s Pectra Upgrade Unlocks Powerful Features — and a Dangerous Flaw

At the center is EIP-7702, which allows users to delegate wallet control via offchain signatures. While meant to simplify smart account functionality, the change means a malicious signature — acquired through phishing or fake apps — can rewrite wallet code and forward control to an attacker’s contract. No transaction confirmation required.

Security experts warn that even hardware wallets are now exposed if users unknowingly approve delegation messages. Because these signatures bypass standard formats and can be replayed across chains, detecting them is difficult.

Adding to the risk, these delegation messages often appear as simple, unsigned hashes — making them harder for wallets to flag or interpret. Without clear warnings from wallet interfaces, users may unknowingly hand over control of their accounts.

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Although multisig wallets still offer protection, most individual wallets — including cold storage — need urgent updates to handle the new signature type. Until then, signing an unfamiliar message could mean instant and irreversible loss.

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