The DeFi world woke up to another major blow on November 3, 2025, after Balancer, a popular decentralized finance protocol, was hit with a major exploit that drained more than $116.6 million worth of assets across multiple blockchains.
The hack drained large amounts of osETH, WETH, and wstETH, raising new concerns about the security of the DeFi protocol.
Here’s how the attached thing happened?
How the Balancer Hack Happened?
According to data shared by on-chain analytics company Lookonchainthe exploit started with a massive outflow of money from Balancer Vaults. Analysts believe the hacker took advantage of a faulty access control vulnerability within Balancer’s fortified pools that use Ether-based derivatives.
The attacker extracted approximately $116.6 million from the Ethereum mainnet alone, followed by similar incidents in the Base, Polygon, Arbitrum, Optimism, and Sonic networks.
The transfers included major crypto assets such as 6,587 WETH (worth $24.46 million), 6,851 osETH ($26.86 million) and 4,259 wstETH ($19.27 million).
Impact extends beyond Balancer
Interestingly enough, the attack didn’t just stop at Balancer. The forked version, Beets on the Sonic Network, also reported losses. This suggests that the exploit targeted a shared vulnerability in the codebase that connects to the same liquidity infrastructure.
Meanwhile, transaction data shows that the stolen funds were transferred to a single wallet via Balancer’s vault contracts address 0x506D19…AE03207which then interacted with another contract to perform multiple token swaps.
Community and security response
Blockchain security company PeckShield quickly confirmed the breach, urging users to revoke all Balancer-related approvals and monitor wallet activity. Lookonchain also released transaction data showing the attacker’s movement of stolen funds between multiple vault addresses, typical of money laundering attempts via decentralized exchanges.
So far, Balancer has not issued an official statement, but the Discord moderators have warned users from interacting with suspicious contracts or new liquidity pools until further notice.
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