A critical CME Group data center in Aurora, Illinois experienced a service outage exceeding 10 hours from the evening of Nov. 27 to the morning of Nov. 28, JinShi reports. Temperatures at the facility reached nearly 49 degrees Celsius after cooling equipment failed, approximately 48% above the U.S. industry-standard maximum. The exchange did not activate its backup data center in the New York area, with sources familiar with the matter suggesting major trading firms may have lacked sufficient technical infrastructure at the backup facility and preferred to await restoration of the Aurora site.

CME Group suspended futures and options trading on November 28 due to a data center failure, affecting markets encompassing trillions of dollars in contracts including S&P 500 index futures, U.S. Treasuries, crude oil, gasoline, and palm oil, Bloomberg reports. The foreign exchange platform EBS resumed service at 12:00 p.m. London time after hours of downtime. Gerald Gan, deputy chief investment officer at Singapore's Reed Capital Partners, described the outage as "very annoying" and noted that alternative platforms may lack CME's liquidity depth. The disruption occurred the day after Thanksgiving during a half-day trading session in U.S. markets and exceeded the duration of a 2019 technical-error-related outage lasting several hours.

CME Group announced on November 28 that its BrokerTec EU market has reopened for trading. All other CME markets, including Bitcoin, Ethereum, and Solana futures, remain suspended following a cooling system failure at a CyrusOne data center. The technical disruption earlier halted commodity and cryptocurrency futures trading across CME platforms.

CryptoQuant CEO Ki Young Ju said on Nov. 28 that the Upbit security incident is allegedly tied to the North Korea-linked Lazarus Group, BlockBeats reports. Upbit disclosed a vulnerability that could allow private key inference. Ki noted that few entities beyond North Korean hackers would possess the capability to exploit such a flaw if the claim proves accurate.

Upbit CEO Oh Kyung-seok issued a public apology on November 28, confirming approximately 44.5 billion KRW in asset losses linked to a cyberattack, the exchange said. The affected assets include roughly 38.6 billion KRW in user funds and 5.9 billion KRW in company-owned assets, with about 2.3 billion KRW already frozen. The platform identified a security vulnerability through analysis of on-chain transaction records that allowed private key inference, which has since been patched. Upbit has suspended all digital asset deposits and withdrawals while conducting a comprehensive wallet system overhaul, and has committed to fully compensating users from its own reserves.

Chicago Mercantile Exchange suspended trading across its markets on November 28 due to a cooling system malfunction at a CyrusOne data center, the exchange said. The halt affected CME's electronic trading platforms. The exchange operator provided no timeline for resumption.

S&P 500 futures and Nasdaq 100 futures recorded no trading data since 03:44 GMT on Nov. 28, LSEG data show. The absence of trading activity in these major index futures contracts has been observed across market data feeds, with LSEG data systems reporting no transaction records for either contract following the specified timestamp.