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CVE-2026-84969 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:3.7 LOWVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CNA: [email protected]CVSS-B:3.7 LOWVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://jira.mongodb.org/browse/CDRIVER-6410	[email protected]	Vendor AdvisoryIssue Tracking

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-787	Out-of-bounds Write	[email protected]

Affected Products

Product	Versions
mongodb c driver	>= 1.30.0, < 1.30.9 >= 2.0.0, < 2.5.2
CPE cpe:2.3:a:mongodb:c_driver::::::mongodb::* Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Sep 10, 2026	Initial Analysis	[email protected]
Sep 3, 2026	CVE Modified	CISA-ADP
Sep 3, 2026	New CVE Received	[email protected]