CVE-2026-84966

Fixed in a distro release EPSS <1%CVSS 5.1

An incorrect numeric type conversion in the BSON document building component of the MongoDB C++ Driver may cause a length value to be interpreted incorrectly. When an application supplies an extremely large, non-terminated field name to the builder, the library may read memory outside the intended buffer and terminate the calling process. No authentication is required, but the calling application must pass the oversized name in a specific form.

Published 2026-09-03 · CVE record · OSV

Products: mongodb c_driver

Distro releases