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CVE-2026-47137 critical CVSS 10.0

Vulnerability in vm2 (CVE-2026-47137)

Summary

Vulnerability in vm2 (CVE-2026-47137). Successful exploitation can lead to full system takeover. Exploitable via nodevm.js. Mitigation: upgrade to 3.11.4 or later.

Original description

The description as published by the source.

Summary

The fix for GHSA-8hg8-63c5-gwmx (CVE-2023-37903) introduced a check in nodevm.js line 263 that blocks the combination nesting: true + require: false. However, the check uses strict equality (options.require === false), which is trivially bypassed by omitting the require option entirely.

When require is not specified, options.require is undefined, not false. The strict equality check fails, so the security guard is skipped. Immediately after (line 280), the destructuring default require: requireOpts = false assigns requireOpts = false, producing the exact configuration the patch was designed to prevent.

Root Cause

// nodevm.js:263 — the security check
if (options.nesting === true && options.require === false) {
    throw new VMError('...');
}
// nodevm.js:280 — the default assignment (AFTER the check)
const { require: requireOpts = false } = options;
// When options.require is undefined:
//   - Line 263: undefined === false → FALSE → check skipped
//   - Line 280: requireOpts = false → same as require:false

Impact

Full Remote Code Execution on the host system. An attacker running code inside a NodeVM({ nesting: true }) sandbox (without specifying require) can:

  1. require('vm2') to get the vm2 library
  2. Construct an inner NodeVM with require: { builtin: ['child_process'] }
  3. Execute arbitrary OS commands via child_process.execSync

The inner VM is completely unconstrained by the outer sandbox configur…

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-47137 has been found in vm2.
Attackers can target a specific entry point like nodevm.js over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 10.0/10.
What to do: upgrade vm2 to 3.11.4 or later.
If unsure, ask your IT team or search "vm2 CVE-2026-47137" on the vendor's site.

CVE-2026-47137 (vm2) — CWE-913 / CVSS v3 10.0
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: nodevm.js / require / options.require / undefined
Patched: 3.11.4 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-913) exists in vm2. Attackers reach the vulnerable code path via nodevm.js without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of vm2. Attack surface: nodevm.js / require / options.require / undefined.

🔥 Severity

Severity: Critical (CVSS 10.0/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 3.11.4.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'vm2' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'vm2' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で vm2 を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade vm2 to 3.11.4

    ステージング環境で 3.11.4 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

npm vm2
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.11.4"}]}]

References

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