Arbitrum DeFi Ostium, 26.8 Billion Won Leaked Due to Oracle Time Manipulation
Approximately 26.8 billion won (about $18 million USD) in funds have been drained from an Arbitrum (ARB) based DeFi project due to a sophisticated attack involving oracle price data manipulation. The attacker exploited the 'PriceUpKeep forwarder' component of Ostium's automated infrastructure by submitting price data with future timestamps to create seemingly advantageous transactions, ultimately stealing USDC.
How this call is verified
▼ Bearish call was checked against the actual BTC price 24h later: ✓ Hit (-1.05%).
Bar: BTC ±1% within 24h · every verdict lands on the public ledger
Key takeaway
"Arbitrum DeFi Ostium, 26.8 Billion Won Leaked Due to Oracle Time Manipulation" — BullBear's AI rates this story as a bearish (negative) signal for markets, with a market-impact score of 75 out of 100. Approximately 26.8 billion won (about $18 million USD) in funds have been drained from an Arbitrum (ARB) based DeFi project due to a sophisticated attack involving oracle price data manipulation. The attacker exploited the 'PriceUpKeep forwarder' component of Ostium's automated infrastructure by submitting price data with future timestamps to create seemingly advantageous transactions, ultimately stealing USDC. Reported by TokenPost on July 15, 2026. The call is verified against the actual 24-hour price move on BullBear's public conviction ledger.
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