News linked to both this project and an event.
According to Ostium's official report, the core of this attack lies in the compromise of the off-chain price reporting system permissions, unrelated to smart contract vulnerabilities. After obtaining off-chain authorization, the attacker utilized the protocol's registered legitimate forwarding paths to submit forged prices ($5,000 and $60,000) to the BTC-USD market, atomically completing an open-close position arbitrage cycle within the same transaction. Starting with 100 USDC and rolling to amplify the scale across 8 transactions, they extracted 23.75 million USDC from the OLP vault within 5 minutes until the vault circuit breaker mechanism was triggered. The root cause lies in the off-chain infrastructure lacking a multi-party approval mechanism equivalent to on-chain multi-signature, creating a single-point permission vulnerability. The stolen funds have been converted to ETH and mixed via Tornado Cash; tracking efforts are still ongoing.
Odaily News: Headline: "Loss of 23.75 Million USDC: Ostium Price Data Attacked". According to Ostium's monitoring, Ostium has released an update on the security incident. Its liquidity provider treasury was attacked on July 15, resulting in a loss of 23,752,746 USDC. Preliminary investigations indicate that the attacker compromised the off-chain infrastructure that supplies price data to the protocol, submitting disguised, fraudulent price reports. By rapidly opening and closing multiple large positions, the attacker extracted artificially generated profits from the treasury. Ostium stated that trader collateral is stored in separate, isolated smart contracts and was unaffected by this incident; all trading positions remain open. The team paused trading and froze all trading contracts within 60 minutes of the first attack transaction. Currently, Ostium is cooperating with Mandiant, zeroShadow, Collisionless, SEAL 911, and law enforcement agencies, and is coordinating with trading platforms, bridge contracts, and stablecoin issuers to advance the investigation. The engineering team is repairing and strengthening the relevant infrastructure to support a safe resumption of trading. Ostium stated it will notify at least 24 hours in advance before thawing the trading contracts. Once trading resumes, existing positions will be marked at the price at the time of reopening, unaffected by price fluctuations during the suspension.
Odaily reports, perpetual contract DEX Ostium stated that platform trading remains paused following a security incident. User positions remain open but cannot be modified for now, and trading margin funds are still held in the frozen trading smart contract without any movement.Ostium stated that its team is continuously coordinating with relevant authorities, SEAL 911, and multiple security researchers. Updates regarding the resumption of smart contract activities and the timeline for fund recovery will be released subsequently.According to PeckShield monitoring, approximately 24 million USDC from Ostium's public OLP vault was stolen. The attacker subsequently swapped these funds for approximately 12,100 ETH, of which about 10,500 ETH was transferred to Tornado Cash.
According to monitoring by on-chain analyst PeckShield (@PeckShieldAlert), the public OLP vault of decentralized perpetual contract protocol Ostium (@Ostium) was attacked, with approximately 24 million USDC stolen. The attacker subsequently swapped the stolen funds for 12,080 ETH and has transferred 10,540 ETH into the mixer Tornado Cash to obscure the fund flow. On-chain tracing shows that the attacker's initial funds originated from ChangeNow and Bybit, with 1 ETH transferred from each to the attacker's wallet (0x321D...8bfD9).
Decentralized trading protocol Ostium paused trading due to suspected exploitation of its oracle system, with security firms Blockaid and CertiK estimating losses between $18 million and $22 million.
Ostium, a decentralized perpetual exchange, suffered an oracle attack on Wednesday, resulting in losses of approximately 18 million USDC. The attacker submitted false price reports for future dates using compromised oracle signing keys, generating fictitious trading profits and receiving payouts from the Ostium liquidity vault. Ostium stated that it has identified the issue with the OLP vault, has suspended all trading, and the team is currently investigating. Deployed on Arbitrum, Ostium offers perpetual futures trading for real-world assets including stocks, commodities, forex markets, and indices. At the time of the attack, the total value locked (TVL) in the Ostium protocol was approximately $63 million. The attack drained nearly one-third of this liquidity. In the first five months of 2026, DeFi protocols have lost over $840 million to exploits, including $292 million from KelpDAO and $285 million from Drift Protocol.
according to on-chain analyst Yujin's monitoring, half an hour ago, an address (0x321...bfd9) with the DeBank username musti_akrep profited 23.75 million USDC by exploiting a vulnerability on Perp DEX Ostium and withdrew it. The 23.75 million USDC was withdrawn to the Arbitrum chain and immediately exchanged for 12,085 ETH at a price of $1,965. Currently, these 12,085 ETH remain on the Arbitrum chain.
Blockaid stated that it detected a vault exploit incident involving Ostium on Arbitrum. The attacker fabricated false trading profits through registered PriceUpKeep Forwarders and authorized oracle reports with future timestamps, triggering a payout of approximately 18 million USDC from the vault.