DeFi's $755M Quarter Gets a $9M Encore: Bonzo Lend Oracle Hole Drains HBAR Pool 🕳️

Hedera-based lending protocol Bonzo Lend lost approximately $9 million after an attacker manipulated the price of SAUCE used as collateral, allowing the account to borrow assets far beyond the value deposited. In a preliminary incident report published Saturday, Bonzo said the attacker deposited 250 SAUCE, worth only a few dollars, before submitting a price update that inflated the token's value by roughly 12 orders of magnitude. The wallet then borrowed 6.63 million USDC and 34.5 million wrapped HBAR from the lending pool, according to the protocol.

Bonzo attributed the incident to a flaw in Supra's on-chain oracle verifier, which accepted a manipulated SAUCE price carrying a zeroed signature. The protocol said Supra acknowledged the issue and deployed a fix, while stressing that the incident was not a vulnerability in Bonzo Lend's contracts or Hedera's core network. The case illustrates how oracle failures can turn low-value collateral into a tool for draining large amounts of liquidity from lending protocols, even when the application and underlying network continue operating as designed.

The Bonzo incident follows a similar collateral-pricing exploit on Stellar. In February, attackers drained roughly $10 million from a YieldBlox DAO-managed lending pool after manipulating the price path used to value USTRY collateral, allowing them to borrow assets beyond the token's real worth. Both episodes point to oracle dependencies as a recurring attack surface across non-EVM networks.

The incident adds to a growing number of exploits targeting decentralized finance (DeFi) protocols in 2026. The second quarter had become the most-hacked quarter on record by incident count, with 83 exploits and about $755 million stolen, according to CryptoRank. Cross-chain bridge exploits accounted for $351 million, while compromised administrator attacks and fake token price manipulation represented 37% of quarterly losses. CryptoRank recorded 121 hacks and roughly $942 million in losses over the period, saying repeated security incidents likely weighed on user confidence and reinforced capital outflows.

DeFi's total value locked (TVL) had fallen 39% to over $70 billion in June from about $115 billion in January, reflecting the broader capital contraction that has coincided with the rising hack count. The Bonzo loss sits inside that trend, with a single oracle mispricing converting a few dollars of SAUCE into millions of USDC and wrapped HBAR withdrawn from the protocol in a single transaction.