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CVE-2026-84969

3.7 · LOW

A memory-handling error in the BSON-to-JSON conversion helpers of the MongoDB C Driver can write a small number of bytes past the end of a heap buffer when a binary field is encoded and the output…

Published Sep 3, 2026mongodbCWE-787EPSS 0.27%

Overview

CVE-2026-84969 is a low-severity vulnerability affecting mongodb c_driver. It was published on September 3, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A memory-handling error in the BSON-to-JSON conversion helpers of the MongoDB C Driver can write a small number of bytes past the end of a heap buffer when a binary field is encoded and the output is cut short at a caller-configured length limit. A party who supplies the document content, with no privileges on the application that links the driver, may cause a small amount of data outside the intended buffer to be altered.

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>= 1.30.0, < 1.30.9Affected

References

Refjira.mongodb.org/browse/CDRIVER-6410

How CyberStrike helps

Frequently asked questions

What is CVE-2026-84969?

CVE-2026-84969 is a low-severity vulnerability affecting mongodb c_driver. It was published on September 3, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

How severe is CVE-2026-84969?

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-84969?

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-2026-84969?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-84969 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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