CVE-2026-114647: CWE-943: Improper Neutralization of Special Elements in Data Query Logic in MongoDB C# Driver
Description
The MongoDB C# Driver does not reject replacement documents whose top-level field names begin with a dollar sign in FindOneAndReplace, unlike other replace operations. An application that builds such a document from user-supplied field names can have the server apply update operators instead of a full replacement. The effect is limited to the document matched by the application's own filter, whose contents can be modified in ways the application did not intend.
CVSS v4.0
Score 5.3medium
Affected software
MongoDB
C# Driver
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-10-21T21:57:44.493Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ada649f4d27ba8daa755e42
Added to database: 10/22/2026, 19:31:43 UTC
Last updated: 10/22/2026, 19:31:43 UTC
Views: 2
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