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Uniswap Labs releases a new security feature known as Permit 2

Uniswap Labs released a new security feature known as Permit 2.

On January 18, Uniswap Labs, the developer of the popular decentralized exchange (DEX) Uniswap, released a new security feature known as Permit 2.

This development aims to address the critical “infinite token allowances” vulnerability, which poses a potential risk to user funds. By introducing Permit2, Uniswap Labs hopes to improve user protection and control over digital assets.

In the context of decentralized finance (DeFi), “token allowance” refers to a permission mechanism that users grant to smart contracts, granting them access to tokens.

This permission is required for users to interact with different decentralized applications (DApps), such as decentralized exchanges and lending platforms.

This token allowance, however, is vulnerable to the “infinite token allowance” vulnerability. In such cases, hackers can gain unrestricted and unauthorized access to user funds, potentially draining them without the user’s knowledge.

Uniswap Labs addresses this vulnerability with Permit2, an open-source tool. This tool provides additional security and control by allowing users to set time limits on token approvals.

Users can restrict third-party access to funds for specific periods, lowering the risk of unauthorized access.

Key Features of Permit2:

  • Time-Limited Token Approvals: Users can define specific periods during which third parties can access their funds.
  • Reusable Token Approval: Users can streamline transactions by avoiding repetitive granting of fund access for each transaction.
  • Gas-Saving Mechanism: Permit2 employs signature-based approvals and transfers, reducing gas fees for token transfers.

This security enhancement precedes the upcoming release of Uniswap v4, which will include the innovative Hooks feature. Hooks give developers more flexibility and control over their applications within the Uniswap ecosystem.

Despite Uniswap’s strong management of over $4.4 billion in assets, UNI token prices are under pressure. UNI is currently facing resistance around $8.1 after a 20% drop from its December high.

Analysts warn that a significant drop below $6 may spark further sell-offs, pushing the token to $4.5 or lower.


James Wilson is a crypto writer and researcher with over 5 years of experience in the industry. He is a graduate of the University of California, Berkeley, where he studied computer science and economics. After graduating, he worked as a software engineer at a major tech company before transitioning to a career in crypto.