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CVE-2026-106437 Details

Description

The BSON buffer-reservation API in the MongoDB C Driver can record a length smaller than the five-byte BSON minimum. Later append or comparison operations can underflow unsigned length calculations and read or write outside the document buffer. An actor who can influence the length supplied by an embedding application can cause the application to terminate or read or corrupt adjacent process memory. Reaching this issue requires the application to pass an undersized value to bson_reserve_buffer and then perform an affected operation.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.4 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CNA: [email protected]CVSS-B:6.2 MEDIUMVector:CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://jira.mongodb.org/browse/CDRIVER-6423	[email protected]	Vendor AdvisoryIssue Tracking

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-191	Integer Underflow (Wrap or Wraparound)	[email protected]

Affected Products

Product	Versions
mongodb c driver	>= 1.4.0, < 1.30.13 >= 2.0.0, < 2.5.6
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
Oct 27, 2026	Initial Analysis	[email protected]
Oct 8, 2026	CVE Modified	CISA-ADP
Oct 8, 2026	New CVE Received	[email protected]