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CVE-2026-106437

7.4, high

MongoDB C Driver Integer Underflow Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.4, high high CVSS v3.1
EPSS, next 30 days
<0.1% higher than 0.7% of scored CVEs
Exploitation
No public evidence
Published
8 Oct 202620 days ago

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.

Details

Vendor
MongoDB
Product
C Driver
Weakness
CWE-191 (opens in a new tab)
Status
Analyzed
Updated
27 Oct 2026
Assigner
cna@mongodb.com

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References 1

Advisories 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other MongoDB CVEs

Every MongoDB CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2025-14847 MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability KEV EPSS 83% 7.5, high
  • CVE-2019-10758 MongoDB mongo-express Remote Code Execution Vulnerability KEV EPSS 85% 9.9, critical
  • CVE-2026-106432 The BSON encoder in the MongoDB PHP Driver converts a string length to a 32-bit value without validation EPSS 0.2% 8.2, high
  • CVE-2026-88027 Improper neutralization of special elements in data query logic in the embedded-document relation handling of the MongoDB integration… EPSS 0.3% 8.1, high
  • CVE-2026-88032 MongoDB Java Driver Use-After-Free Vulnerability EPSS 0.3% 7.5, high
  • CVE-2026-88033 Improper neutralization of special elements in data query logic in the GridFS component of the MongoDB Java Driver can cause a… EPSS 0.5% 8.3, high
  • CVE-2026-82066 MongoDB Server Out-of-Bounds Read Vulnerability EPSS 0.4% 8.1, high
  • CVE-2026-84964 MongoDB C Driver Double Free Vulnerability EPSS 0.3% 7.5, high

Beyond this page

Is CVE-2026-106437 in your network?

This page tells you how dangerous CVE-2026-106437 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 28 Oct 2026, not the live upstream state.