Permit2 Signature Phishing: New Gasless Authorization Theft Attack - Blog Article Cover

Technical Security

2026-03-27

10 min read

Permit2 Signature Phishing: New Gasless Authorization Theft Attack

Permit2 and EIP-2612 signature phishing is sweeping through the crypto community. Just one signature, no gas fees, and your tokens can be drained. Learn the attack mechanism and prevention.

#Permit2#signature phishing#gasless authorization#EIP-2612#token theft#authorization attack

What is Permit2?

Permit2 is an authorization contract developed by Uniswap that allows offline signature authorization:

User signs authorization (no gas needed)

Third party submits transaction execution (pays gas)

Attack Mechanism Explained

Why It's Dangerous

Real Attack Case

Case 1: Fake Uniswap Frontend

In February 2026, attackers deployed a highly realistic Uniswap phishing website:

Domain: uniswqp.org (note spelling error)

Induced "claim UNI airdrop" which was actually Permit2 authorization signature

47 victims, total loss $890,000

How to Identify Permit2 Phishing

Pre-Signature Checklist

1**spender address** - If it's an unfamiliar address, stop immediately

2**amount field** - If it shows extremely large numbers, this is unlimited authorization

3**domain.name** - Confirm it's the official Permit2 contract

Security Tools

Fire (fire.xyz) - Wallet security plugin

Pocket Universe (pocketuniverse.app) - Transaction preview

Revoke.cash - Authorization checking

Emergency Response If Phished

1Use revoke.cash to revoke Permit2 authorization

2If attacker hasn't acted yet, immediately transfer assets to new address

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Victim of Permit2 Phishing? Time is critical! Our technical team can assist with emergency revocation and tracking attacker addresses.

[Emergency Technical Support](/contact)

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