CVE-2026-81528
Description
A MongoDB C# driver document-replacement code path omits the element-name/shape validation that the equivalent write paths apply, so a value supplied as a replacement is forwarded to the server without neutralization of query-language special elements. An application that passes untrusted, loosely-typed input as a replacement value therefore allows that input to be interpreted by the database as update logic rather than as data, executing under the application's own database credentials. Applications using strongly-typed document mappings are not affected.
How to fix
- mongodb c\#_driver3.11.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mongodb c\#_driver | 2.10.0 ≤ v < 3.11.1 | 3.11.1 |
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