Vulnerability in vm2 (CVE-2026-44002)
Summary
Vulnerability in vm2 (CVE-2026-44002). Risk of unauthorized operations or information disclosure. Exploitable via CallSite. Mitigation: upgrade to 3.11.0 or later.
Original description
The description as published by the source.
Summary
vm2's CallSite wrapper class (intended as a safe wrapper for V8's native CallSite) blocks getThis() and getFunction() to prevent host object leakage, but allows getFileName() to return unsanitized host absolute paths. Any sandboxed code can extract the full directory structure, library paths, and framework versions of the host server.
Details
In lib/setup-sandbox.js:436-466, the CallSite class overrides getThis() and getFunction() with undefined to prevent host object references from leaking into the sandbox. However, the following methods pass through unsanitized values from the original V8 CallSite object:
getFileName()— returns host absolute paths like/app/node_modules/vm2/lib/vm.jsgetLineNumber(),getColumnNumber()— exact source locationsgetFunctionName(),getMethodName(),getTypeName()— internal function names
Two exploitation paths exist:
- Default
error.stack:new Error().stackincludes host frame paths in the formatted string - Custom
prepareStackTrace: Attacker can setError.prepareStackTraceto directly callgetFileName()on each CallSite, extracting a clean list of all host paths
PoC
Library-level PoC (Node.js script — primary):
const { VM } = require("vm2");
const vm = new VM();
// Path A — Default error.stack
const result1 = vm.run(`try { null.x; } catch(e) { e.stack }`);
console.log(result1);
// Output includes: /app/node_modules/vm2/lib/vm.js:289:18
//…
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-2026-44002 has been found in vm2.
Attackers can target a specific entry point like CallSite over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.8/10.
What to do: upgrade vm2 to 3.11.0 or later.
If unsure, ask your IT team or search "vm2 CVE-2026-44002" on the vendor's site.
CVE-2026-44002 (vm2) — CWE-209 / CVSS v3 5.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: CallSite / undefined / error.stack / prepareStackTrace
Patched: 3.11.0 — 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.
A vulnerability (CWE-209) exists in vm2. Attackers reach the vulnerable code path via CallSite without authentication.
Check the vendor advisory for the affected versions of vm2. Attack surface: CallSite / undefined / error.stack / prepareStackTrace.
Severity: Medium (CVSS 5.8/10). Risk of unauthorized operations or information disclosure.
Update to 3.11.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
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
-
1Identify 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。 -
2Apply patch patch
Upgrade vm2 to 3.11.0ステージング環境で 3.11.0 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。
-
3Post-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
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com