VULNERABILITY INTELLIGENCE

CVE-2026-84966

CVSS score5.1 MEDIUM
EPSS probability0.14%
CISA KEVNot currently listed
Published2026-09-03
Last modified2026-09-22
CVSS vectorCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

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.

Weakness classification

  • cna@mongodb.com: CWE-681

Primary references