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CVE-2026-47135 patriksimek CVE debrief

CVE-2026-47135 is a HIGH-severity vulnerability in vm2, an open-source vm/sandbox for Node.js. Prior to version 3.11.4, the Symbol.for override in setup-sandbox.js only intercepts 2 of 9 dangerous Node.js cross-realm symbols. This allows sandbox code to obtain real cross-realm symbols, write them to host objects, and control host-side behavior. The vulnerability has been patched in version 3.11.4.

Vendor
patriksimek
Product
vm2
CVSS
HIGH 8.7
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, an open-source vm/sandbox for Node.js, should be aware of this vulnerability and take steps to upgrade to version 3.11.4 or later.

Technical summary

The vulnerability is caused by the incomplete interception of dangerous Node.js cross-realm symbols in the Symbol.for override in setup-sandbox.js. This allows sandbox code to obtain real cross-realm symbols, write them to host objects, and control host-side behavior. The vulnerability has a CVSS score of 8.7 and is classified as HIGH severity.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to vm2 version 3.11.4 or later.
  • Review and update any custom sandbox code to ensure it does not rely on the vulnerable behavior.

Evidence notes

The vulnerability was patched in version 3.11.4. References to the patch and advisory can be found at [ref-5](https://github.com/patriksimek/vm2/releases/tag/v3.11.4) and [ref-6](https://github.com/patriksimek/vm2/security/advisories/GHSA-m5q2-4fm3-vfqp).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47135 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47135

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

  • CVE-2026-47135 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47135

    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.