CVE-2026-47209Public exploitNetwork attack vector

Host code execution via ignored Proxy receiver

Published Jun 12, 2026 · Updated Jun 12, 2026

Sandbox escape in Patrik Simek vm2 3.11.3 and earlier allows remote attackers to execute code in the host process through sandbox input. The BaseHandler.set trap in bridge.js discards the Proxy receiver and calls otherReflectSet on the host target, so inherited property assignments cross the sandbox boundary instead of creating properties on the child object. Exploitation requires sandbox code to hold a host-object reference; crafted Symbol-keyed writes then alter host behavior and enable host-process code execution.

CVSS severity8.6
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox escape in Patrik Simek vm2 3.11.3 and earlier allows remote attackers to execute code in the host process through sandbox input. The BaseHandler.set trap in bridge.js discards the Proxy receiver and calls otherReflectSet on the host target, so inherited property assignments cross the sandbox boundary instead of creating properties on the child object. Exploitation requires sandbox code to hold a host-object reference; crafted Symbol-keyed writes then alter host behavior and enable host-process code execution.

The record

CVE
CVE-2026-47209
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
Patrik Simek
Product
vm2
Classifications
CWE-693, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.11.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Patrik Simek · vm2version=< 3.11.4

Published CVSS scores

8.6GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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