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

🚨 **Essence**: SandboxJS < 0.8.26 fails to isolate `AsyncFunction` within `SandboxFunction`. 💥 **Consequences**: This flaw allows **Sandbox Escape** and **Remote Code Execution (RCE)**. Critical integrity loss.

Q: Root Cause? (CWE/Flaw)

🛡️ **CWE**: CWE-94 (Improper Control of Generation of Code). 🔍 **Flaw**: The sandbox environment does not properly isolate asynchronous functions, breaking the security boundary.

Q: Who is affected? (Versions/Components)

📦 **Vendor**: nyariv. 📦 **Product**: SandboxJS. ⚠️ **Affected**: Versions **prior to 0.8.26**. Ensure you are not running legacy builds.

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

👑 **Privileges**: Full Remote Code Execution. 📊 **Data**: High impact on Confidentiality, Integrity, and Availability. Attackers gain complete control over the host system.

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

🔓 **Threshold**: **LOW**. 📝 **Details**: CVSS Vector `AV:N/AC:L/PR:N/UI:N`. No authentication, no user interaction, and network-accessible. Extremely easy to exploit remotely.

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

💣 **Exploit**: **YES**. 🔗 **PoC**: Public Proof-of-Concept available at `https://github.com/Galaxy-sc/CVE-2026-23830-SandBreak`. Wild exploitation is possible.

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

🔍 **Check**: Scan for SandboxJS installations. 📋 **Version**: Verify if version is **< 0.8.26**. Look for improper `AsyncFunction` handling in the sandbox context.

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

✅ **Fix**: **YES**. 🔧 **Patch**: Update to **SandboxJS 0.8.26** or later. Official advisory: `GHSA-wxhw-j4hc-fmq6`. Commit `345aee6` addresses the issue.

Q: What if no patch? (Workaround)

🚧 **Workaround**: If patching is delayed, **disable** the `SandboxFunction` or restrict `AsyncFunction` usage. Isolate the service in a container with strict capabilities.

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **CRITICAL**. ⏱️ **Priority**: Immediate action required. High CVSS score + Public PoC + No Auth needed = High risk of active exploitation.

Question 1

What is this vulnerability? (Essence + Consequences)

Accepted Answer

🚨 **Essence**: SandboxJS < 0.8.26 fails to isolate `AsyncFunction` within `SandboxFunction`.
💥 **Consequences**: This flaw allows **Sandbox Escape** and **Remote Code Execution (RCE)**. Critical integrity loss.

Question 2

Root Cause? (CWE/Flaw)

Accepted Answer

🛡️ **CWE**: CWE-94 (Improper Control of Generation of Code).
🔍 **Flaw**: The sandbox environment does not properly isolate asynchronous functions, breaking the security boundary.

Question 3

Who is affected? (Versions/Components)

Accepted Answer

📦 **Vendor**: nyariv.
📦 **Product**: SandboxJS.
⚠️ **Affected**: Versions **prior to 0.8.26**. Ensure you are not running legacy builds.

Question 4

What can hackers do? (Privileges/Data)

Accepted Answer

👑 **Privileges**: Full Remote Code Execution.
📊 **Data**: High impact on Confidentiality, Integrity, and Availability. Attackers gain complete control over the host system.

Question 5

Is exploitation threshold high? (Auth/Config)

Accepted Answer

🔓 **Threshold**: **LOW**.
📝 **Details**: CVSS Vector `AV:N/AC:L/PR:N/UI:N`. No authentication, no user interaction, and network-accessible. Extremely easy to exploit remotely.

Question 6

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

Accepted Answer

💣 **Exploit**: **YES**.
🔗 **PoC**: Public Proof-of-Concept available at `https://github.com/Galaxy-sc/CVE-2026-23830-SandBreak`. Wild exploitation is possible.

Question 7

How to self-check? (Features/Scanning)

Accepted Answer

🔍 **Check**: Scan for SandboxJS installations.
📋 **Version**: Verify if version is **< 0.8.26**. Look for improper `AsyncFunction` handling in the sandbox context.

Question 8

Is it fixed officially? (Patch/Mitigation)

Accepted Answer

✅ **Fix**: **YES**.
🔧 **Patch**: Update to **SandboxJS 0.8.26** or later. Official advisory: `GHSA-wxhw-j4hc-fmq6`. Commit `345aee6` addresses the issue.

Question 9

What if no patch? (Workaround)

Accepted Answer

🚧 **Workaround**: If patching is delayed, **disable** the `SandboxFunction` or restrict `AsyncFunction` usage. Isolate the service in a container with strict capabilities.

Question 10

Is it urgent? (Priority Suggestion)

Accepted Answer

🔥 **Urgency**: **CRITICAL**.
⏱️ **Priority**: Immediate action required. High CVSS score + Public PoC + No Auth needed = High risk of active exploitation.

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CVE-2026-23830 — 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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