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CVE-2026-47137 patriksimek CVE debrief

CVE-2026-47137 is a critical vulnerability in vm2, an open-source vm/sandbox for Node.js. Prior to version 3.11.4, a fix introduced for GHSA-8hg8-63c5-gwmx (CVE-2023-37903) was incomplete. The check in nodevm.js line 263 blocks the combination nesting: true + require: false using strict equality (options.require === false). However, this check can be bypassed by omitting the require option entirely, causing options.require to be undefined rather than false. This allows an attacker to bypass the security guard. Immediately after, line 280 assigns requireOpts = false via destructuring default, producing the exact configuration the patch aimed to prevent.

Vendor
patriksimek
Product
vm2
CVSS
CRITICAL 10
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 sandbox for Node.js, especially those using versions prior to 3.11.4, should be aware of this critical vulnerability.

Technical summary

The vulnerability arises from a flawed security check in vm2's nodevm.js. Specifically, the check for require: false uses strict equality, which can be bypassed by not specifying the require option, making it undefined. This issue was patched in version 3.11.4.

Defensive priority

High

Recommended defensive actions

  • Update vm2 to version 3.11.4 or later.
  • Review and restrict the use of vm2 configurations that could be exploited.

Evidence notes

CVE-2026-47137 has a CVSS score of 10 and is considered CRITICAL. It was published on 2026-06-12T15:16:28.137Z and modified on 2026-06-12T16:03:15.620Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47137 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47137

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

  • CVE-2026-47137 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47137

    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.