CVE-2026-92954 — vm2 is a sandbox library for running untrusted JavaScript in Node.js.¶
Key facts
CVE-2026-92954 is a High (8.6) vulnerability: vm2 is a sandbox library for running untrusted JavaScript in Node.js.. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-92954 |
| Severity | High (8.6) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-92954/ |
Details¶
English | 한국어
Description¶
vm2 is a sandbox library for running untrusted JavaScript in Node.js. In versions >= 3.10.0 and <= 3.11.7, Promises returned from the host realm into the sandbox are not marked as handled at the bridge boundary; only Promises created inside the sandbox are wrapped with a rejection-swallowing handler (lib/setup-sandbox.js), and the bridge only installs host-side rejection sanitizers when sandbox code calls .then/.catch/.finally. As a result, code running in the sandbox can invoke a host function that returns a rejected Promise (for example events.once() exposed via the NodeVM events builtin, or any embedder-provided Promise-returning API) and simply ignore the return value, leaving the host Promise unhandled so that Node.js's default unhandled-rejection behavior terminates the host process. This is an incomplete fix of GHSA-hw58-p9xv-2mjh. The issue is fixed in version 3.11.8.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-92954 |
| CVSS Score | 8.6 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-92954/poc.py
Usage¶
# Run PoC against target
python3 poc.py --target <TARGET_URL>
# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>
⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.
Test Lab¶
This repository includes a Docker-based test environment with both vulnerable and patched applications.
Quick Start¶
# Clone and navigate to CVE directory
cd CVE-2026-92954
# Start both applications
docker-compose up -d
# Run tests
./run-tests.sh # Linux/Mac
./run-tests.ps1 # Windows PowerShell
Application Endpoints¶
| Application | URL | Status |
|---|---|---|
| Vulnerable App | http://localhost:8080 | Shows vulnerability |
| Patched App | http://localhost:8081 | Demonstrates fix |
Directory Structure¶
├── README.md # English documentation
├── README_KO.md # Korean documentation
├── poc.py # PoC detection script
├── docker-compose.yml # Container orchestration
├── run-tests.sh # Linux/Mac test runner
├── run-tests.ps1 # Windows test runner
├── vulnerable-app/ # Vulnerable version
│ ├── app.py
│ ├── Dockerfile
│ └── requirements.txt
└── patched-app/ # Fixed version
├── app.py
├── Dockerfile
└── requirements.txt
References¶
- https://github.com/patriksimek/vm2/security/advisories/GHSA-gjq8-xm47-88rc
- https://www.vulncheck.com/advisories/vm2-3.10.0-through-3.11.5-denial-of-service-via-host-promise
Generated by PoC Generator on 2026-09-18T00:34:01.299615888
Frequently asked questions¶
What is CVE-2026-92954?¶
CVE-2026-92954 is a High (8.6) vulnerability: vm2 is a sandbox library for running untrusted JavaScript in Node.js.. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-92954?¶
Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.
How do I block or mitigate CVE-2026-92954?¶
Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.
For authorized security testing and research only. See the full source and NVD record.