Vulnerability in MongoDB Entity Framework Core Provider

[ Description ]Official description

The MongoDB Entity Framework Core provider does not neutralize special elements in values passed to SetProperty when an ExecuteUpdate call also contains a setter that reads the entity being updated. In that case the update is sent as an aggregation pipeline, and a caller-supplied string beginning with $ is evaluated as an expression rather than stored as data. A party who can influence such a value may modify or remove fields in the records being updated, or copy other fields of the same record into them.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund3 Nov 2026WID-SEC-2026-4328

  MongoDB (EF Core Provider, Atlas SQL, C Treiber, Rust Treiber, Database Tools and Node.js Treiber): Multiple vulnerabilities Translated from German

  Risk mediumCVE-2026-119672CVE-2026-120954CVE-2026-120678+12 more CVEs

[ References ]References

• jira.mongodb.org/browse/EF-478