Question 1

What is this vulnerability? (Essence + Consequences)

Accepted Answer

🚨 **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.

Question 2

Root Cause? (CWE/Flaw)

Accepted Answer

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

Question 3

Who is affected? (Versions/Components)

Accepted Answer

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

Question 4

What can hackers do? (Privileges/Data)

Accepted Answer

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

Question 5

Is exploitation threshold high? (Auth/Config)

Accepted Answer

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

Question 6

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

Accepted Answer

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

Question 7

How to self-check? (Features/Scanning)

Accepted Answer

🔍 **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.

Question 8

Is it fixed officially? (Patch/Mitigation)

Accepted Answer

✅ **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).

Question 9

What if no patch? (Workaround)

Accepted Answer

🚧 **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.

Question 10

Is it urgent? (Priority Suggestion)

Accepted Answer

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

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CVE-2026-26956 — AI Deep Analysis Summary

Q1What is this vulnerability? (Essence + Consequences)

Q2Root Cause? (CWE/Flaw)

Q3Who is affected? (Versions/Components)

Q4What can hackers do? (Privileges/Data)

Q5Is exploitation threshold high? (Auth/Config)

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

Q7How to self-check? (Features/Scanning)

Q8Is it fixed officially? (Patch/Mitigation)

Q9What if no patch? (Workaround)

Q10Is it urgent? (Priority Suggestion)

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