Ostium, a perpetuals trading exchange built on the Arbitrum network, suffered an $18 million loss after attackers compromised one of the platform's oracle signer keys. By gaining control of that key, the hackers were able to manipulate the exchange's price feed, feeding false market data into the protocol. This manipulation let them exploit mispriced positions and drain funds from the platform. Oracle systems are critical infrastructure for DeFi protocols, supplying the external price information that determines trades, liquidations, and settlements, which makes their security keys a high-value target. The incident adds to a growing list of DeFi exploits that hinge on oracle vulnerabilities rather than flaws in core smart contract logic. The breach underscores ongoing risks around key management and price feed integrity for decentralized derivatives platforms operating on layer-2 networks like Arbitrum.
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