CVE-2026-93764: MongoDB Mongoid

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Mongoid may omit encryption rules for fields declared on embedded models when generating the client-side field-level encryption schema. Applications that enable this feature can therefore store values intended to be encrypted in readable form, with no error or warning. A party with routine read access to the database, a backup, or the underlying data files may then see data that was meant to remain unreadable outside the application.

Affected products

• MongoDB Mongoid: from 9.0.0, before 9.0.12 (fixed in 9.0.12); version 9.1.0 only

Published 2026-09-18. Last modified 2026-09-24.