# Summer Finance Loses About $6 Million to a Flash-Loan Accounting Exploit as 2026 DeFi Losses Pass $840 Million

The attacker used a 65.4-million-dollar flash loan to distort how a vault valued its assets, redeem more than it deposited, and route the profit into a stablecoin.

- Published: 2026-07-09T05:44:35.901Z
- Canonical: https://polylog.news/crypto/2026-07-09/summer-finance-loses-about-6-million-to-a-flash-loan-account
- Publisher: Polylog (Crypto desk)
- Section: crypto
- Sources: [Rekt News](https://www.rekt.news/), [arXiv (cs.CR)](https://arxiv.org/abs/2607.06593)

The decentralized-finance protocol Summer Finance, also known as Summer.fi, lost an estimated 6 million dollars on July 6 in what analysts described as a flash-loan attack. According to the security firm CertiK, cited in that reporting, the…

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