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lowLogic errorEVM-Solidity

Oracle-free AMM invariant rounding allows slow drain

Payout
$9k
Protocol
Stableswap Pool
Disclosed
Apr 9, 2024
Source
hats

A directional rounding flaw in the Newton-Raphson solver for a StableSwap invariant enabled subtle value extraction during token exchanges. When computing invariant values and target balances, both routines rounded down, yielding an extra wei of token output t …

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References

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