CVE-2026-81528

Summary

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.

Affected Software

Weaknesses

• CWE-943: CWE-943: Improper Neutralization of Special Elements in Data Query Logic

References

• https://jira.mongodb.org/browse/CSHARP-6158
• https://www.nuget.org/packages/MongoDB.Driver/3.11.1

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