CVE-2026-114650: CWE-838: Inappropriate Encoding for Output Context in MongoDB C# Driver
Description
A flaw in the client-side encryption support of the MongoDB .NET/C# driver can cause data designated for client-side field-level encryption to be written without encryption. Under certain platform text-encoding configurations, an internal name conversion loses information, so the encryption layer fails to associate the operation with its configured encryption rules and the operation proceeds without an error being raised. An application user with the ability to write data through an affected application can therefore have sensitive fields persisted in plaintext, defeating the confidentiality guarantee that client-side encryption is intended to provide. No integrity or availability impact was observed.
CVSS v4.0
Score 6.9medium
Affected software
MongoDB
C# Driver
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-10-21T21:57:49.528Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ada649f4d27ba8daa755e45
Added to database: 10/22/2026, 19:31:43 UTC
Last updated: 10/22/2026, 19:31:43 UTC
Views: 3
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