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CVE-2026-47131 is a critical sandbox escape vulnerability in the vm2 library for Node.js affecting versions prior to 3.11.4. The flaw arises from weaknesses in vm2's proxy-based isolation, specifically insufficient protection against prototype mutation through the proxy apply trap. By abusing accessor lookups against native Buffer objects using lookupGetter and lookupSetter, an attacker can surface a host-originated Node.js ERR_INVALID_ARG_TYPE exception and recover the host realm TypeError constructor. From there, the attacker can reach the host Function constructor and break out of the sandbox. The issue affects code executed inside vm2's VM sandbox and can be triggered with minimal attacker-controlled JavaScript, ultimately enabling arbitrary code execution in the host context.
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No public exploit code observed for this vulnerability.
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A critical sandbox escape vulnerability in the vm2 Node.js library that allows arbitrary command execution on the host by abusing bridged host prototype mutator functions and leaking the host Function constructor.
A critical vm2 sandbox escape that abuses getter/setter lookups on internal Buffer objects to obtain host-side constructors and escape the sandbox for RCE.
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.