Sandbox escape in vm2 via dangerous cross-realm symbols
CVE-2026-47135 is a sandbox escape vulnerability in vm2, the Node.js vm/sandbox library. In versions prior to 3.11.4, vm2's Symbol.for override in setup-sandbox.js intercepts only 2 of 9 dangerous Node.js cross-realm symbols. In addition, the bridge layer's set, defineProperty, and deleteProperty traps do not enforce an isDangerousCrossRealmSymbol check on symbol keys. This incomplete filtering allows attacker-controlled sandbox code to obtain real cross-realm symbols and write, define, or delete symbol-keyed properties on host objects exposed to the sandbox. The issue was reportedly validated with a full util.promisify hijack chain, demonstrating that sandboxed code can influence host-side behavior by manipulating Node.js symbol-driven semantics.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Recent activity
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.