VM2 Sandbox Escape Allows Arbitrary Code Execution

vm2 is an open source vm/sandbox for Node.js. Prior to version 3.11.0, VM2 suffers from a sandbox breakout vulnerability. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system. This issue has been patched in version 3.11.0.

Casky was already ahead

This CVE exploits attack patterns that Casky's 301matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

VM2 is a popular Node.js sandbox designed to safely execute untrusted code in isolated environments. This critical vulnerability (CVSS 9.8) allows attackers to break out of the sandbox entirely and execute arbitrary commands on the host system. The issue stems from improper input validation (CWE-94: Improper Control of Generation of Code) and insufficient resource controls (CWE-693), making it a severe threat to any application using VM2 to run user-supplied or third-party code. Organizations relying on VM2 for security isolation—such as code execution platforms, automation tools, and serverless environments—face direct compromise risks if running unpatched versions prior to 3.11.0.

Casky's 301 matching skills detect the attack patterns underlying this vulnerability by mapping to MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance). When practitioners analyze their environment through Casky's Claude-powered extended reasoning, they gain visibility into exploitation chains: reconnaissance activity probing for VM2 deployments, followed by malicious code injection designed to break containment boundaries. The platform's skill set identifies suspicious code patterns characteristic of sandbox escape attempts—such as prototype chain manipulation, object property access to restricted APIs, and calls to host system functions. Practitioners would receive findings highlighting vulnerable VM2 instances in their dependency trees, anomalous process execution originating from sandboxed contexts, and code analysis results flagging escape techniques, enabling rapid remediation before exploitation occurs.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

301 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-24118.

analyzing-apt-group-with-mitre-navigator

threat intelligence · low

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analyzing-campaign-attribution-evidence

threat intelligence · low

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analyzing-certificate-transparency-for-phishing

threat intelligence · low

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MITRE ATT&CK Techniques

TA0001 TA0043

Investigate the attack patterns behind CVE-2026-24118

Casky has 301 skills that investigate the attack patterns behind CVE-2026-24118. Run one and get CVSS-scored findings in 3 minutes.

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