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CVE-2026-84970

6.2 · MEDIUM

A numeric truncation weakness exists in the JSON parsing component of the MongoDB C++ Driver's BSON library.

Published Sep 3, 2026mongodbCWE-681EPSS 0.12%

Overview

CVE-2026-84970 is a medium-severity vulnerability affecting mongodb c\+\+_driver. It was published on September 3, 2026 and has a CVSS 3.1 base score of 6.2 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.2, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

A numeric truncation weakness exists in the JSON parsing component of the MongoDB C++ Driver's BSON library. An actor who controls the text that an embedding application hands to the library's public JSON parsing interface, when that text is very large, can cause the library to read memory beyond the supplied buffer and return it to the caller, to silently accept only part of the input as a complete document, or to terminate the process. No MongoDB server, credentials, or non-default configuration is required; the effect is confined to the process that uses the library.

Remediation

Check the references section for vendor advisories and patches from mongodb. Update c\+\+_driver to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
mongodbc\+\+_driver>= 3.2.0, < 4.5.2Affected

References

Refjira.mongodb.org/browse/CXX-3547

How CyberStrike helps

Frequently asked questions

What is CVE-2026-84970?

CVE-2026-84970 is a medium-severity vulnerability affecting mongodb c\+\+_driver. It was published on September 3, 2026 and has a CVSS 3.1 base score of 6.2 (MEDIUM).

How severe is CVE-2026-84970?

This vulnerability has a CVSS 3.1 base score of 6.2, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-84970?

Check the references section for vendor advisories and patches from mongodb. Update c\+\+_driver to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-84970?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-84970 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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