Yearn Finance reported a security breach on November 30 that resulted in approximately $9 million in losses. The attack targeted a vulnerability in a legacy yETH stableswap pool, allowing unauthorized token minting. Blockchain security firm PeckShield tracked roughly $3 million of the stolen funds to Tornado Cash, while the remaining $6 million remains in the exploiter's wallet.

Yearn Finance's yETH product suffered an exploit on November 30, 2025, enabling unlimited token minting that drained Balancer pools. Attackers extracted approximately 1,000 ETH valued at $3 million and transferred the funds through Tornado Cash, according to blockchain journalist Colin Wu. The platform confirmed its V2 and V3 Vaults remained unaffected and operational.

Bitcoin declined approximately 5% within 24 hours to $86,415.88 as weakening technical momentum met deteriorating market liquidity. The several-thousand-dollar drop occurred without news catalyst, exposing fragile liquidity conditions and record-high leverage that have defined this year's trading environment. Weekend sessions have repeatedly produced unusually large price swings, with thin order books allowing modest selling to trigger cascading liquidations.

Bitcoin dropped below $86,000 on December 1, 2025, marking its steepest decline in recent weeks and erasing prior gains. The downturn triggered more than $400 million in liquidations across leveraged cryptocurrency futures positions. Global digital asset market capitalization contracted approximately 4% to around $3 trillion, according to market data.

Yearn Finance confirmed an exploit targeting its yETH liquid staking token pool on November 30, 2025. An attacker exploited an infinite-mint vulnerability to drain millions in liquid staking tokens, routing approximately 1,000 ETH (around $3 million) to Tornado Cash. The protocol stated that Yearn Vaults V2 and V3 remain unaffected.

Bitcoin dropped to $86,053 during Asian trading on Monday, declining 5.4%, while Ethereum fell 6.1% to $2,819. Data show approximately $608 million in cryptocurrency liquidations occurred over the past 24 hours, with long positions accounting for more than $535 million of the total.

Michael Saylor departed from his year-long Sunday routine of posting orange dots that preceded Bitcoin purchases, instead introducing green dots on November 30, 2025. The change has sparked debate over whether Strategy might pursue stock buybacks or alter its Bitcoin holdings. The company's stock has fallen 38% year-to-date, limiting its ability to raise capital through share issuance.

Yearn Finance's yETH vault suffered a security breach that resulted in approximately $3 million worth of ETH being stolen. The attacker exploited a smart contract vulnerability to mint excessive tokens and drain the liquidity pool. Other Yearn vaults remained unaffected, with V2 and V3 operations continuing normally.