medium5.3
CVE-2026-114647
NoSQL operator injection via unvalidated replacement document in findOneAndReplace
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| MongoDB | C# Driver | from 2.13.0 before 3.13.0 |