---
id: "CVE-2026-114643"
kind: "vulnerability"
aliases: ["CVE-2026-114643"]
title: "MongoDB C# Driver: GeoJSON extra members can collide with reserved names"
severity: "medium"
cvss: 5.4
epss: 0.00372
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["csharp", "dotnet", "mongodb", "package"]
not_affected_if: ["no-user-supplied-geojson-fields"]
published_at: "2026-10-22T19:17:37+00:00"
first_seen_at: "2026-10-23T21:57:31+00:00"
updated_at: "2026-10-25T04:14:21+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114643", "first_seen_at": "2026-10-23T21:57:31+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-114643", "first_seen_at": "2026-10-24T07:15:51+00:00"}]
---

# MongoDB C# Driver: GeoJSON extra members can collide with reserved names

The MongoDB C# Driver writes GeoJSON extra members without checking whether their names clash with reserved members such as type and coordinates. An application that uses user-supplied field names there can store documents with duplicate geometry fields, so the server and driver read different values and records can become unreadable through the driver.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- unknown

## Fix

- unknown

## Timeline

- 2026-10-23T21:57:31+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-114643
- 2026-10-24T07:15:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-114643

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_