---
id: CVE-2026-114643
title: Duplicate geometry fields via unvalidated GeoJSON extra members
summary: >-
  The MongoDB C# Driver writes GeoJSON extra members without checking whether
  their names collide with reserved GeoJSON members such as type and
  coordinates. An application that places user-supplied field names into these
  extra members can…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L'
cvssSource: cna
cwe:
  - CWE-694
vendor: MongoDB
product: C# Driver
affected:
  - c_driver >= 1.8.0 < 3.13.0
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T21:25:30.085Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114643'
references:
  - url: 'https://jira.mongodb.org/browse/CSHARP-6179'
  - url: 'https://github.com/mongodb/mongo-csharp-driver/releases/tag/v3.13.0'
  - url: >-
      https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-mqvm-xxqr-vqw5
tags:
  - cve.org
ingestedAt: '2026-10-22T22:00:50.445Z'
---

## Overview

The MongoDB C# Driver writes GeoJSON extra members without checking whether their names collide with reserved GeoJSON members such as type and coordinates. An application that places user-supplied field names into these extra members can store documents with duplicate geometry fields, so the server and the driver resolve different values for the same record. Affected records can also become unreadable through the driver, interrupting application code that reads them.

## Affected

- `c_driver >= 1.8.0 < 3.13.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.