CVE-2026-82059
An internal aggregation expression in MongoDB Server was incorrectly registered as accessible to any authenticated user rather than being restricted to internal cluster operations. By crafting a malformed index specification within this expression, an authenticated user with read-only privileges could trigger an assertion failure in the index key generation code path. In certain build configurations, this assertion failure results in termination of the mongod process, causing a denial of service to all connected clients.
- Published Sep 8, 2026
- CVSS 6.0 medium
- 0.4% chance of exploitation in the next 30 days (EPSS)