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CVE-2026-47209
high
CVSS 8.6
Vulnerability in vm2 (CVE-2026-47209)
Summary
vulnerability in vm2 (CVE-2026-47209). Data can be tampered with by attackers. Exploitable via ``BaseHandler.set``. Mitigation: upgrade to `3.11.4` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-47209** has been found in vm2.
Attackers can target a specific entry point like ``BaseHandler.set`` over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 8.6/10.
What to do: upgrade vm2 to **3.11.4** or later.
If unsure, ask your IT team or search "vm2 CVE-2026-47209" on the vendor's site.
CVE-2026-47209 (vm2) — CWE-693 / CVSS v3 8.6
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: `BaseHandler.set` / `bridge.js` / `receiver` / `set`
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-693) exists in vm2. Attackers reach the vulnerable code path via ``BaseHandler.set`` without authentication.
📍 Affected scope
vm2 — . Attack surface: `BaseHandler.set` / `bridge.js` / `receiver` / `set`.
🔥 Severity
Severity: High (CVSS 8.6/10). Data can be tampered with by attackers
🔧 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 (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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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。
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6Apply 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-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 Step 3 と同じログクエリ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
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-47209
- package https://github.com/patriksimek/vm2
- web https://github.com/patriksimek/vm2/security/advisories/GHSA-c4cf-2hgv-2qv6
- web https://github.com/patriksimek/vm2/commit/26d0318b5e6555be4b187ba05d6cf378ccecfe22
- web https://github.com/patriksimek/vm2/releases/tag/v3.11.4
- web https://github.com/advisories/GHSA-c4cf-2hgv-2qv6