Ostium Vault Suffers $18 Million Exploit on Arbitrum via Oracle Attack

• Blockaid detected an Ostium exploit involving future-dated oracle price reports.
• The attacker used Ostium’s PriceUpKeep forwarder to trigger artificial trading profits.
• Approximately $18 million USDC was drained from the protocol’s liquidity vault.

Ostium, a decentralized perpetual exchange on Arbitrum, experienced a major security breach that resulted in the loss of approximately $18 million USDC. Blockchain security firm Blockaid flagged the incident on 15 July 2026, stating that a registered component of Ostium’s price-feed automation system was exploited.

Blockaid detected an @Ostium Vault exploit on Arbitrum.

An attacker used a registered PriceUpKeep forwarder and future-dated authorized oracle reports to create artificial trade profit, triggering a ~$18M USDC payout from the vault.
More details in

— Blockaid (@blockaid_) July 15, 2026

According to Block…

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