CVE-2026-47131Public exploitNetwork attack vector

Host code execution via prototype-chain severing

Published Jun 12, 2026 · Updated Jun 12, 2026

Sandbox escape in Patrik Simek vm2 before 3.11.4 allows remote attackers to execute arbitrary host code through crafted JavaScript. The lib/bridge.js apply trap unwraps a host object and forwards indirect calls to the host proto setter, severing the TypeError prototype chain so a later error exposes the host Function constructor. Exploitation requires an embedding application to run attacker-controlled code in a VM sandbox; successful escape grants the Node.js process's host privileges.

CVSS severity10.0
Critical
EPSS probability0.62%
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 before 3.11.4 allows remote attackers to execute arbitrary host code through crafted JavaScript. The lib/bridge.js apply trap unwraps a host object and forwards indirect calls to the host proto setter, severing the TypeError prototype chain so a later error exposes the host Function constructor. Exploitation requires an embedding application to run attacker-controlled code in a VM sandbox; successful escape grants the Node.js process's host privileges.

The record

CVE
CVE-2026-47131
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
Patrik Simek
Product
vm2
Classifications
CWE-913, 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

10.0GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-913Improper Control of Dynamically-Managed Code Resources
T1059.007JavaScript/JScript

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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