PANews reported on November 6th that Balancer released a preliminary incident report on the v2 vulnerability exploit, stating that Hypernative monitoring detected an exploit targeting Balancer V2 Composable Stable Pools at 15:46 (UTC+8) on Monday. Affected networks include Ethereum, Base, Avalanche, Gnosis, Berachain, Polygon, Sonic, Arbitrum, and Optimism. The initial root cause is an incorrect rounding direction in the `EXACT_OUT` function of the `batchSwap` and `upscale` functions, leading to manipulation of pool balances. CSP v6 has been automatically paused and Recovery Mode enabled ; CSP v5 is affected. Mitigation progress: StakeWise recovered approximately 5,041 osETH and 13,495 osGNO ; Base MEV and BitFinding recovered approximately $750,000; Monerium froze approximately 1.3 million Euros ; Berachain suspended its chain; and Sonic froze related addresses. The final losses are pending verification by multiple parties.PANews reported on November 6th that Balancer released a preliminary incident report on the v2 vulnerability exploit, stating that Hypernative monitoring detected an exploit targeting Balancer V2 Composable Stable Pools at 15:46 (UTC+8) on Monday. Affected networks include Ethereum, Base, Avalanche, Gnosis, Berachain, Polygon, Sonic, Arbitrum, and Optimism. The initial root cause is an incorrect rounding direction in the `EXACT_OUT` function of the `batchSwap` and `upscale` functions, leading to manipulation of pool balances. CSP v6 has been automatically paused and Recovery Mode enabled ; CSP v5 is affected. Mitigation progress: StakeWise recovered approximately 5,041 osETH and 13,495 osGNO ; Base MEV and BitFinding recovered approximately $750,000; Monerium froze approximately 1.3 million Euros ; Berachain suspended its chain; and Sonic froze related addresses. The final losses are pending verification by multiple parties.
Balancer: EXACT_OUT rounding error combined with batchSwap causes pool balance manipulation.
PANews reported on November 6th that Balancer released a preliminary incident report on the v2 vulnerability exploit, stating that Hypernative monitoring detected an exploit targeting Balancer V2 Composable Stable Pools at 15:46 (UTC+8) on Monday. Affected networks include Ethereum, Base, Avalanche, Gnosis, Berachain, Polygon, Sonic, Arbitrum, and Optimism. The initial root cause is an incorrect rounding direction in the `EXACT_OUT` function of the `batchSwap` and `upscale` functions, leading to manipulation of pool balances. CSP v6 has been automatically paused and Recovery Mode enabled ; CSP v5 is affected. Mitigation progress: StakeWise recovered approximately 5,041 osETH and 13,495 osGNO ; Base MEV and BitFinding recovered approximately $750,000; Monerium froze approximately 1.3 million Euros ; Berachain suspended its chain; and Sonic froze related addresses. The final losses are pending verification by multiple parties.
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