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CVE-2026-47139 patriksimek CVE debrief

CVE-2026-47139 is a HIGH severity vulnerability in vm2, an open-source vm/sandbox for Node.js. The vulnerability allows sandboxed code to make outbound HTTP(S) requests and open listening HTTP sockets, despite the public network modules being denied. This is possible due to the exposure of underscored internal HTTP builtins such as _http_client and _http_server, which are not blocked when public modules are excluded.

Vendor
patriksimek
Product
vm2
CVSS
HIGH 8.6
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 if they are using a version prior to 3.11.4 and have configured NodeVM to exclude public network builtins.

Technical summary

Prior to version 3.11.4, NodeVM in vm2 supports excluding public network builtins from the wildcard builtin option. However, this configuration does not block access to internal HTTP builtins such as _http_client and _http_server. As a result, sandboxed code can use these internal builtins to bypass the intended restrictions and make outbound HTTP requests or open listening HTTP sockets.

Defensive priority

HIGH

Recommended defensive actions

  • Update vm2 to version 3.11.4 or later.
  • Review and adjust NodeVM configurations to ensure proper restrictions on public network builtins.

Evidence notes

CVE-2026-47139 has a CVSS score of 8.6 and is classified as HIGH severity. The vulnerability was published on 2026-06-12T15:16:28.273Z and last modified on 2026-06-12T17:16:23.737Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47139 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47139

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

  • CVE-2026-47139 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47139

    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.