According to CoinMeta, Arcus DEX suffered a hacker attack on November 9th for $2.223 million. The reason was an accounting vulnerability that allowed newly created accounts to record balances far higher than the actual holdings and to withdraw funds. The attackers also attempted to withdraw an additional $3 million, but the withdrawals were prevented before they could be processed due to the on-chain rate limitations. Arcus detected and fixed this vulnerability within about 90 minutes, blocked the attackers' addresses, and temporarily suspended withdrawals. The company has covered the entire shortfall of $2.223 million from its treasury and stated that no other users' balances, positions, or orders were affected. The stolen funds are being tracked on the blockchain, and Arcus is coordinating with blockchain investigators and law enforcement authorities to pursue their recovery.