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CVE-2026-92941 critical CVSS 10.0

Vulnerability in vm2 (CVE-2026-92941)

Summary

Vulnerability in vm2 (CVE-2026-92941). Confidential information can be exposed externally. Exploitable via Host header. Mitigation: upgrade to 3.11.7 or later.

Original description

The description as published by the source.

Summary

vm2 3.11.6 exposes the host tls module to a NodeVM when that builtin is explicitly allowed. Although the module object is wrapped as read-only, its functions still execute against process-wide host state. On Node.js versions that provide tls.setDefaultCACertificates(), sandbox code can replace the certificate authorities trusted by subsequent host-realm TLS clients.

The exploit needs only the narrowly allowed tls and url builtins. It does not require fs, process, module, child_process, an external package, or a general '*' builtin grant. A host HTTPS request rejected an attacker certificate before sandbox execution, then accepted the same certificate and returned an application marker after the sandbox replaced the default CA list.

This crosses the intended sandbox boundary. An attacker can make host HTTPS clients trust an attacker-controlled CA, enabling credential theft and response tampering when the attacker can influence a subsequent destination or network path. Replacing the list also removes the normal trust roots, disrupting unrelated host TLS traffic.

Details

The vulnerable boundary is the default builtin loader in lib/builtin.js. Builtins that are not classified as dangerous are exposed through a recursive read-only bridge:

builtins.set(key, special ? special : vm => vm.readonly(hostRequire(key)));

The read-only wrapper prevents ordinary property assignment through the sandbox proxy. It does not make calls such as `…

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-2026-92941 has been found in vm2.
Attackers can target a specific entry point like Host header over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 10.0/10.
What to do: upgrade vm2 to 3.11.7 or later.
If unsure, ask your IT team or search "vm2 CVE-2026-92941" on the vendor's site.

CVE-2026-92941 (vm2) — CWE-732 / CVSS v3 10.0
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: Host header / tls / NodeVM / url
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-732) exists in vm2. Attackers reach the vulnerable code path via Host header without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of vm2. Attack surface: Host header / tls / NodeVM / url.

🔥 Severity

Severity: Critical (CVSS 10.0/10). Confidential information can be exposed externally.

🔧 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":"3.11.3"},{"fixed":"3.11.7"}]}]

References

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