CVE-2026-9100 — Out-of-Bounds $1
CVE-2026-9100 — The MongoDB C Driver's legacy GridFS API accepts malformed file metadata from the database without adequate validation. Crafted documents in a GridFS collection may cause any application that reads those files via the legacy API to either crash (via a division-by-zero) or silently le
What This Means For You
- If your environment is affected by CWE-1285, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-9100 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
MongoDB C Driver GridFS Out-of-Bounds Read or Division by Zero — CVE-2026-9100
title: MongoDB C Driver GridFS Out-of-Bounds Read or Division by Zero — CVE-2026-9100
id: scw-2026-05-20-ai-1
status: experimental
level: high
description: |
Detects the execution of MongoDB C Driver (mongoc) processes that appear to be interacting with GridFS, potentially triggering the out-of-bounds read or division-by-zero vulnerability (CVE-2026-9100) due to malformed metadata.
author: SCW Feed Engine (AI-generated)
date: 2026-05-20
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-9100/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: process_creation
detection:
selection:
Image|contains:
- 'mongoc'
CommandLine|contains:
- 'gridfs'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-9100 | vulnerability | CVE-2026-9100 |
| CWE-1285 | weakness | CWE-1285 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 20, 2026 at 20:16 UTC |
This content was curated and summarized by Shimi's Cyber World for informational purposes. It is not copied or republished in full. All intellectual property rights remain with the original author and source.
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