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Balancer V2 Rounding Exploit: $128M Drained in 30 Minutes

Balancer V2's $128M exploit on November 3, 2025 came from a batchSwap rounding error that 11 audits missed. Technical vector and builder risk framework.

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Balancer V2 Rounding Exploit: $128M Drained in 30 Minutes

On November 3, 2025, an attacker drained $128M from Balancer V2 Composable Stable Pools across six blockchains in under 30 minutes — using a rounding error that survived 11 audits.

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Abstract visualization of the Balancer V2 DeFi exploit — liquidity pool curves collapsing as precision rounding errors cascade through the batchSwap function, draining $128 million across six blockchains.

Web3 Fraud Files8 min read

Balancer V2 Rounding Exploit: $128M Drained in 30 Minutes

On November 3, 2025, an attacker drained $128M from Balancer V2 Composable Stable Pools across six blockchains in under 30 minutes — using a rounding error that survived 11 audits.

Zashleen Singh

Apr 1, 2026