Balancer confirms a rounding error in its smart contracts caused the $128 million DeFi exploit across multiple blockchains.
- Balancer attributes $128M exploit to smart contract rounding error.
- Affected assets include ETH and Balancer Pool Tokens.
- Immediate action included pausing impacted pools for recovery.
Balancer’s recent $128 million DeFi exploit, occurring on November 3, 2025, stemmed from a rounding error in smart contracts across its V2 Composable Stable pools on multiple blockchains.
This incident highlights systemic risks within DeFi’s arithmetic precision, prompting immediate asset safety protocols and recalibrated security measures across decentralized financial systems.
Balancer’s $128 million DeFi exploit on November 3, 2025, is traced to a rounding error in its V2 Composable Stable pools, impacting multiple blockchains.
The incident highlights vulnerabilities within smart contract arithmetic, emphasizing the importance of comprehensive testing for decentralized finance operations.
Rounding Error Triggers $128M Asset Drain
Balancer’s latest $128 million exploit was triggered by a rounding error in its V2 Composable Stable pools. This exposed mathematical flaw led to significant asset draining across major blockchains. “Our team is working with leading security researchers to understand the issue and will share additional findings and a full post-mortem as soon as possible,” said Fernando Martinelli, CEO of Balancer. For more on this, see the DeFi Protocol Balancer Loses $120M.
Involved parties include Balancer’s core team and security researchers who quickly mobilized to address the flaw. Immediate actions comprised pausing affected pools for damage control.
ETH and Balancer Tokens Hit by Exploit
The exploit caused substantial financial losses, primarily impacting ETH and Balancer Pool Tokens. Rapid market responses focused on recovery and protecting assets from further infiltration.
The DeFi community reacted swiftly with heightened awareness campaigns. Links to related updates and discussions can be found on GoPlus Security on Twitter.
Past Incidents Cast Light on Current Flaw
Similar incidents, like Curve’s past arithmetic exploits, provide a backdrop to Balancer’s event. Despite historical precedents, this case ranks among the largest in multi-chain composability.
Future risk mitigation necessitates thorough composability audits. Data and past trends suggest that overlooked mathematical vulnerabilities could lead to continued industry-wide scrutiny. The industry’s focus remains on preventing such faults, as demonstrated by RELX.
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