# DeFi Self-Dealing Exploits Drain Reward Vaults on Ethereum and BNB Chain

Proof-of-concept reconstructions this week detail a roughly 301.7 ETH reward-vault drain and a 605,000 USDT reward-on-transfer attack, both caused by flawed incentive logic rather than stolen keys.

- Published: 2026-07-30T05:29:14.457Z
- Canonical: https://polylog.news/crypto/2026-07-30/defi-self-dealing-exploits-drain-reward-vaults-on-ethereum-a
- Publisher: Polylog (Crypto desk)
- Section: crypto
- Sources: [DeFiHackLabs](https://github.com/SunWeb3Sec/DeFiHackLabs/commit/1b7838bbae4d61f31f79bb714f6198dea41208e4), [DeFiHackLabs](https://github.com/SunWeb3Sec/DeFiHackLabs/commit/b93d31fc0dcce22f0ed79dcf5ff2c5364ebbf87b), [Rekt News](https://www.rekt.news/)

The security-research repository DeFiHackLabs published new proof-of-concept reconstructions of two reward-mechanism exploits. In the first, an attacker drained roughly 301.7 ETH from a project's reward vault on Ethereum through self-dealin…

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