Vulnerability in MongoDB C Driver

[ Description ]Official description

The MongoDB C Driver does not validate the type or format of a namespace field returned by the server in a query response. A MongoDB endpoint that a client application connects to, without needing any credentials, can return a malformed value in that field. This causes the client application process to terminate, and can also cause the driver to read memory outside an allocated buffer and to send a small amount of the application's own uninitialized heap memory back to the endpoint in a follow-up command. The impact is limited to the process that embeds the driver.

[ 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/CDRIVER-6501