Sandbox Escape in vm2 async generator yield* handling
CVE-2026-45411 is a sandbox escape vulnerability in vm2, the Node.js VM/sandbox library, affecting versions prior to 3.11.3. The issue arises from the interaction between vm2’s sandboxing model and V8/ECMAScript async generator semantics. Specifically, an attacker can use yield* inside an async generator and then close the generator via return(value). In the affected path, the supplied value is awaited; if it is a thenable whose then() throws synchronously, V8 handles that exception internally and passes it back to the yield* iterator as the next value. According to the provided analysis, this native handling occurs outside vm2’s JavaScript-level exception transformation and also bypasses vm2’s Promise.prototype.then-based rejection sanitization. As a result, untrusted code running inside vm2 can catch a host exception and leverage it to break out of the sandbox and execute arbitrary commands on the host.
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Impact, mitigation & remediation
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Impact
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Mitigation
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Recent activity
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability involving V8 async generator delegation and native Await/PerformPromiseThen behavior that can evade vm2 sandbox exception and promise rejection sanitization logic.
A sandbox escape vulnerability in vm2 for Node.js that can allow arbitrary command execution on the host system via async generator and yield* exception handling behavior.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.