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CVE-2023-37466 is a critical sandbox escape vulnerability in vm2, a Node.js sandbox library for executing untrusted JavaScript. In vm2 versions up to and including 3.9.19, Promise handler sanitization can be bypassed through the @@species accessor property. The flaw allows attacker-controlled code already executing inside the vm2 sandbox to interfere with Promise species handling and defeat vm2’s intended sanitization of Promise callbacks and related objects. As a result, the isolation boundary between sandboxed code and the host context can be broken, enabling execution of arbitrary code outside the sandbox. The issue was addressed in vm2 version 3.10.0.
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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.
If you can’t patch tonight, do this now.
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.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A prior vm2 sandbox escape vulnerability mentioned only as historical background.
A prior vm2 Promise handler sanitization bypass vulnerability referenced for historical context.
A prior vm2 vulnerability described as an insufficient fix for earlier issues, cited for historical context.
A previously patched vm2 sandbox escape vulnerability referenced as the flaw bypassed by CVE-2026-24120.
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.