CVE-2026-26956 — AI Deep Analysis Summary

Q: What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: A critical sandbox escape in **vm2** (Node.js VM). 💥 **Consequences**: Attackers bypass isolation, gaining **Arbitrary Code Execution (ACE)** on the host. Total loss of security boundaries.

Q: Root Cause? (CWE/Flaw)

🛡️ **CWE**: CWE-693 (Protection Mechanism Failure). 🔍 **Flaw**: The WASM sandbox implementation fails to properly isolate the execution context, allowing access to host process objects.

Q: Who is affected? (Versions/Components)

📦 **Vendor**: patriksimek. 📦 **Product**: vm2. 📉 **Affected**: Version **3.10.4** and likely earlier versions using similar WASM logic. ✅ **Fixed**: Version **3.10.5**.

Q: What can hackers do? (Privileges/Data)

👑 **Privileges**: Full host process access. 💾 **Data**: Complete read/write access to host memory/files. ⚡ **Action**: Execute arbitrary OS commands **without** host collaboration.

Q: Is exploitation threshold high? (Auth/Config)

🔓 **Threshold**: **LOW**. 🔑 **Auth**: None required (PR:N). 🌐 **Vector**: Network (AV:N). 👤 **UI**: None required (UI:N). ⚠️ **AC**: Low complexity (AC:L).

Q: Is there a public Exp? (PoC/Wild Exploitation)

📜 **Public Exp**: No specific PoC code provided in data (POCs: []). 🌍 **Status**: Advisory published. High risk of wild exploitation due to severity (CVSS 9.8).

Q: How to self-check? (Features/Scanning)

🔍 **Check**: Scan for `vm2` dependency in `package.json`. 📊 **Version**: Verify if version is **3.10.4** or lower. 🛠️ **Tool**: Use npm audit or SAST tools detecting CWE-693 in VM implementations.

Q: Is it fixed officially? (Patch/Mitigation)

✅ **Fixed**: Yes. 📥 **Patch**: Upgrade to **vm2 v3.10.5**. 🔗 **Ref**: [GitHub Release v3.10.5](https://github.com/patriksimek/vm2/releases/tag/v3.10.5).

Q: What if no patch? (Workaround)

🚧 **Workaround**: If upgrade impossible, **disable WASM support** in vm2 config if possible. 🛑 **Mitigate**: Avoid using `vm2` for untrusted code. Switch to safer alternatives like Docker containers or WebContainers.

Q: Is it urgent? (Priority Suggestion)

🔥 **Priority**: **CRITICAL** (CVSS 9.8). ⏳ **Urgency**: Immediate patching required. 🚨 **Reason**: Remote, unauthenticated, full host compromise via sandbox escape.

Updated May 08, 2026 CVSS 9.8 · Critical

This is a summary of the AI-generated 10-question deep analysis. The full version (longer answers, follow-up Q&A, related CVEs) requires login. Read the full analysis →

Q1What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: A critical sandbox escape in **vm2** (Node.js VM). <br>💥 **Consequences**: Attackers bypass isolation, gaining **Arbitrary Code Execution (ACE)** on the host. Total loss of security boundaries.

Q2Root Cause? (CWE/Flaw)

🛡️ **CWE**: CWE-693 (Protection Mechanism Failure). <br>🔍 **Flaw**: The WASM sandbox implementation fails to properly isolate the execution context, allowing access to host process objects.

Q3Who is affected? (Versions/Components)

📦 **Vendor**: patriksimek. <br>📦 **Product**: vm2. <br>📉 **Affected**: Version **3.10.4** and likely earlier versions using similar WASM logic. <br>✅ **Fixed**: Version **3.10.5**.

Q4What can hackers do? (Privileges/Data)

👑 **Privileges**: Full host process access. <br>💾 **Data**: Complete read/write access to host memory/files. <br>⚡ **Action**: Execute arbitrary OS commands **without** host collaboration.

Q5Is exploitation threshold high? (Auth/Config)

🔓 **Threshold**: **LOW**. <br>🔑 **Auth**: None required (PR:N). <br>🌐 **Vector**: Network (AV:N). <br>👤 **UI**: None required (UI:N). <br>⚠️ **AC**: Low complexity (AC:L).

Q6Is there a public Exp? (PoC/Wild Exploitation)

📜 **Public Exp**: No specific PoC code provided in data (POCs: []). <br>🌍 **Status**: Advisory published. High risk of wild exploitation due to severity (CVSS 9.8).

Q7How to self-check? (Features/Scanning)

🔍 **Check**: Scan for `vm2` dependency in `package.json`. <br>📊 **Version**: Verify if version is **3.10.4** or lower. <br>🛠️ **Tool**: Use npm audit or SAST tools detecting CWE-693 in VM implementations.

Q8Is it fixed officially? (Patch/Mitigation)

✅ **Fixed**: Yes. <br>📥 **Patch**: Upgrade to **vm2 v3.10.5**. <br>🔗 **Ref**: [GitHub Release v3.10.5](https://github.com/patriksimek/vm2/releases/tag/v3.10.5).

Q9What if no patch? (Workaround)

🚧 **Workaround**: If upgrade impossible, **disable WASM support** in vm2 config if possible. <br>🛑 **Mitigate**: Avoid using `vm2` for untrusted code. Switch to safer alternatives like Docker containers or WebContainers.

Q10Is it urgent? (Priority Suggestion)

🔥 **Priority**: **CRITICAL** (CVSS 9.8). <br>⏳ **Urgency**: Immediate patching required. <br>🚨 **Reason**: Remote, unauthenticated, full host compromise via sandbox escape.

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Vulnerability detail Full AI analysis (login) patriksimek CWE-693