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CVE-2026-43997 is a critical sandbox escape vulnerability in vm2, the Node.js sandbox library used to execute untrusted JavaScript. In affected versions prior to 3.11.0, sandboxed code can obtain a reference to the host Object from outside the intended isolation boundary. Once a genuine host object is exposed inside the sandbox, the attacker can leverage host-side functionality to break out of vm2’s proxy-based protections and execute code in the host context. One documented exploitation path involves calling getOwnPropertySymbols on the exposed host object to retrieve the custom inspect symbol used by Node.js internals, demonstrating access to a real host object rather than a sanitized proxy. The flaw is fixed in vm2 3.11.0.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Critical vm2 sandbox escape / remote code execution vulnerability caused by leakage of a real host Object into the sandbox, enabling access to Function constructor and arbitrary code execution on the host.
A vm2 sandbox escape vulnerability mentioned only in a list of related historical issues.
A prior vm2 sandbox escape vulnerability listed in the security history.
A sandbox escape vulnerability in vm2 for Node.js that allows obtaining the host Object and escaping the sandbox in versions prior to 3.11.0.
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.