---
id: CVE-2026-120955
title: >-
  MongoDB C Driver Modern GridFS mongoc_gridfs_bucket_download_to_stream()
  Aborts Application on Malformed GridFS Metadata
summary: >-
  The GridFS file download API in the MongoDB C Driver does not check the result
  of an internal operation under certain error conditions during file retrieval.
  This can cause the process to terminate when stream operations continue. A
  user…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-476
vendor: MongoDB
product: C Driver
affected:
  - c_driver >= 1.25.0 <= 1.30.14
  - c_driver >= 2.0.0 <= 2.5.7
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-03T20:00:00.676711Z'
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T20:00:13.969Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120955'
references:
  - url: 'https://jira.mongodb.org/browse/CDRIVER-6494'
tags:
  - cve.org
epss: 0.00359
epssPercentile: 0.29852
ingestedAt: '2026-11-05T20:33:06.426Z'
---

## Overview

The GridFS file download API in the MongoDB C Driver does not check the result of an internal operation under certain error conditions during file retrieval. This can cause the process to terminate when stream operations continue. A user who can influence file download parameters can trigger this condition, which may result in service unavailability for applications using the affected API.

## Affected

- `c_driver >= 1.25.0 <= 1.30.14`
- `c_driver >= 2.0.0 <= 2.5.7`

## Remediation

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