MongoDB 9.0: up to 35% faster, substring search on encrypted data and Intelligent Workload Management

MongoDB 9.0 shipped on September 28, 2026 and was presented at MongoDB.local NYC on September 30. The company claims up to 35% faster findOne, up to 30% faster updateOne and up to 2x throughput on large instances; Queryable Encryption now supports prefix, suffix and substring queries in GA, and Intelligent Workload Management throttles load during spikes.

• Up to 35% faster findOne and up to 30% faster updateOne versus 8.0
• Queryable Encryption in GA: prefix, suffix and substring search without server-side decryption
• IWM queues operations and prioritizes short queries during traffic spikes
• Security patches ship on the second Tuesday of each month; 9.0.2 fixed CVE-2026-89099