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CVE-2026-47210 patriksimek CVE debrief

CVE-2026-47210 is a critical sandbox escape vulnerability in vm2, an open-source vm/sandbox for Node.js. The vulnerability allows arbitrary code execution in the host process when untrusted code is executed with async support on runtimes exposing WebAssembly JSPI. This issue was patched in version 3.11.4.

Vendor
patriksimek
Product
vm2
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-12
Advisory published
2026-06-12
Advisory updated
2026-06-12

Who should care

Users of vm2, especially those executing untrusted code with async support, should update to version 3.11.4 or later to mitigate this vulnerability.

Technical summary

The vulnerability occurs when a JSPI-backed Promise can reach Promise.prototype.finally() in a way that bypasses the expected Promise-species hardening and exposes a host-originated rejection object to attacker-controlled species logic, breaking the sandbox boundary.

Defensive priority

High

Recommended defensive actions

  • Update vm2 to version 3.11.4 or later.
  • Avoid executing untrusted code with async support on vulnerable versions of vm2.

Evidence notes

CVE-2026-47210 has a CVSS score of 9.8 and is considered CRITICAL.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47210 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47210

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-47210 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47210

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.