CVE-2026-114647
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.
- Score
- CVSS 4.0 5.3 Medium
- Status
- Awaiting Analysis - cna@mongodb.com
- Published
- 2026-10-22
- Last modified
- 2026-10-23
- Weaknesses
- CWE-943
Affected products
References
- https://jira.mongodb.org/browse/CSHARP-6186
- https://github.com/mongodb/mongo-csharp-driver/releases/tag/v3.13.0
- https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-68cj-624m-mxj3
