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Oracle Error Leaves DeFi Lender Moonwell With $1.8 Million in Bad Debt
A critical oracle pricing glitch has left decentralized lending platform Moonwell grappling with nearly $1.8 million in bad debt.
A misconfigured oracle briefly valued Coinbase Wrapped ETH (cbETH) at just $1 Sunday morning, triggering a sudden cascade of liquidations, in a sobering reminder of the fragility lurking in DeFi infrastructure.
Key Takeaways
- Oracle Failure: A configuration error in Chainlink OEV wrapper contracts caused the system to price $2,200 cbETH at a 99.9% discount.
- Bad Debt Event: Liquidators seized collateral by repaying mere pennies on the dollar, wiping out 1,096 cbETH and leaving the protocol with $1.78 million in bad debt.
- Risk Signal: The incident highlights systemic liquidity risks, mirroring concerns seen as BlockFills freezes withdrawals due to counterparty exposure.
What Caused the Oracle Failure on Moonwell?
According to the postmortem on Moonwell’s Discord, the trouble started Sunday at 6:01 PM UTC following the execution of governance proposal MIP-X43. This upgrade enabled Chainlink OEV wrapper contracts on Base and Optimism, but one feed contained a fatal flaw.
According to risk management firm Anthias Labs, the system failed to multiply the cbETH/ETH exchange rate by the ETH/USD price. Instead, it used the raw exchange rate directly.
This resulted in the oracle reporting a price of roughly $1.12 for an asset trading near $2,200.
Reports indicate the flawed code layout may have been generated by AI tools, specifically Claude Opus 4.6, raising serious questions about audit verification standards for generated code.
— pashov (@pashov) February 17, 2026
cbETH asset's price was set to $1.12 instead of ~$2,200. The PRs of the project show commits were co-authored by Claude – Is this the first hack of vibe-coded Solidity code? pic.twitter.com/4p78ZZvd67
Breaking Down the $1.8M Bad Debt
Trading bots immediately pounced on the discrepancy. With the system believing cbETH was worth barely a dollar, liquidators repaid roughly $1 of debt to seize massive amounts of collateral.
In total, 1,096 cbETH was wiped out. That effectively erased the collateral for many borrowers while leaving the protocol holding the bag for the unpaid loan value.
Moonwell’s risk manager, Anthias Labs, moved fast to contain the bleeding. They reduced supply and borrow caps to 0.01 to prevent new users from entering the broken market.
This type of sudden liquidation cascade shows why Ethereum faces crash risks whenever on-chain leverage is mispriced.
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What This Means for DeFi Lenders
While Moonwell operates across multiple chains with over $90 million in TVL, this incident shakes confidence in automated governance execution. Users must now wait for a governance vote to fix the configuration.
This is not an isolated event. It follows a trend of oracle-related exploits, reinforcing why decentralized protocol security is just as critical as centralized solvency.
The crypto market structure is currently fragile, evidenced by data showing Binance controls 65% of CEX stablecoin reserves.
When liquidity is concentrated and validation fails, the fallout is instant. For yield farmers, this is a signal to check whether your protocol’s code was written by a human or a chatbot before depositing.
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