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CVE-2026-92951 critical CVSS 9.9

Vulnerability in vm2 (CVE-2026-92951)

Summary

Vulnerability in vm2 (CVE-2026-92951). Successful exploitation can lead to full system takeover. Exploitable via NodeVM. Mitigation: upgrade to 3.11.7 or later.

Original description

The description as published by the source.

Summary

vm2 is a sandbox library for isolating and executing untrusted JavaScript code inside a Node.js process. It can restrict access to built-in modules and external packages.

When NodeVM enables an external allowlist together with a custom resolve callback, vm2 checks the requested package name with a non-exact match. For example, if the allowlist only permits left-pad, an attacker can still bypass the check with a colliding package name such as evil-left-pad, because it contains the allowlisted name.

If the colliding package already exists in a host path resolvable by the custom resolver, or if the target application's custom resolver / dependency-management workflow downloads the package and places it in a resolvable path, vm2 loads and executes that package in the host context. This lets sandboxed code bypass the module allowlist and may further lead to host code execution.

Details

NodeVM supports require.external to configure which external npm packages sandboxed code may load. It also supports a custom resolver through require.resolve. This combination is commonly used in business plugin systems, user-script platforms, or sandbox execution environments: the application allows only a small set of trusted dependencies while using a custom resolver that points to the application's own package directory.

The vulnerability is in the allowlist pre-check logic before the custom resolver is called. vm2 generates a regular expression from the `ex…

Source: NIST National Vulnerability Database 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-2026-92951 has been found in vm2.
Attackers can target a specific entry point like NodeVM over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 9.9/10.
What to do: upgrade vm2 to 3.11.7 or later.
If unsure, ask your IT team or search "vm2 CVE-2026-92951" on the vendor's site.

CVE-2026-92951 (vm2) — CWE-706 / CVSS v3 9.9
Attack vector: remote (network-reachable) / no user interaction
Attack surface: NodeVM / external / resolve / require.external
Patched: 3.11.7 — 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-706) exists in vm2. Attackers reach the vulnerable code path via NodeVM.

📍 Affected scope

Check the vendor advisory for the affected versions of vm2. Attack surface: NodeVM / external / resolve / require.external.

🔥 Severity

Severity: Critical (CVSS 9.9/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 3.11.7.

🛡️ 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 3.11.7

    ステージング環境で 3.11.7 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":"3.11.7"}]}]

References

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