Uniswap Detected Bug Doesn’t Refund Unspent ETH In Partial Swaps

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Uniswap Detected Bug Doesn’t Refund Unspent ETH In Partial Swaps

In December 2022, @jeiwan7 found a bug in Uniswap’s SwapRouter contract.

Public Bug Report: Uniswap’s SwapRouter doesn’t refund unspent ETH in partial swaps


I’ll appreciate your thoughts in replies 👇 on whether this is a valid vulnerability or not.

— jeiwan.eth 🦇🔊 (@jeiwan7) January 22, 2023

The developer said the vulnerability was discovered but was rejected by Uniswap security researchers after submitting a bug report.

“You don’t really find critical and high severity bugs in projects like Uniswap, especially after they’ve run in production for several years. So I didn’t really had high expectations and I was sure I wouldn’t be awarded for the report. The bug looks real to me, and I wanted to figure out why would a project with high security standards leave it unfixed.

I submitted a bug report and after more than a month I received their response: they said the bug wasn’t an issue, and everything worked as expected. I cannot agree with this 🙂. Thus I decided to disclose it publicly for some of you to learn something new and for more experienced security researches to decide whether the bug is real or not.”

The bug allows users to lose funds while interacting with the contract in the standard way. Additionally, SwapRouter allows anyone to withdraw ETH from the contract; it could be an MEV bot or anyone calling for refunds after the transaction.

Uniswap Detected Bug Doesn’t Refund Unspent ETH In Partial Swaps

The caller cannot know how much ETH will be spent on a swap, according to his blog post, since the Quoter contract, which is used to compute swaps before executing them, only returns the output amount and not the input amount. Even if the input amount computed by the pool had been returned, a slippage check would have been necessary on the input amount since a price change might have caused the calculated input amount to change at the time the transaction was executed.

Previously, Coincu also reported a critical vulnerability in Uniswap, which has been fixed that may have cost consumers millions of dollars. This bug was established due to Uniswap’s decision to introduce the Universal Router, which combines NFTs and ERC-20 tokens into a single swap router.

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