Ubisoft Shuts Down Rainbow Six Siege After MongoDB Exploit Hits Players

Over 87,000 MongoDB instances are at risk from a critical memory leak called MongoBleed. Following the chaos at Ubisoft, see how this zero-password flaw works and how to protect your data.

Thousands of gamers found themselves locked out of their accounts this week after a major security flaw forced Ubisoft to pull the plug on its hit game, Rainbow Six Siege. For those who don’t follow the gaming world, Siege is a massive tactical shooter game where teams work together to storm or defend buildings. It is a flagship title for Ubisoft, but over the holiday weekend, it became the most visible victim of a newly discovered vulnerability in MongoDB software, dubbed MongoBleed.

We're aware of an incident currently affecting Rainbow Six Siege. Our teams are working on a resolution.

We will share further updates once available.

— Rainbow Six Siege X (@Rainbow6Game) December 27, 2025

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