CVE-2026-47208Public exploitNetwork attack vector

Host command execution via Promise species hijack

Published Jun 12, 2026 · Updated Jun 12, 2026

Sandbox escape in Patrik Simek vm2 before 3.11.4 allows attackers to execute arbitrary commands on the host through crafted sandbox code. The localPromise constructor invokes the host Promise.prototype.then without resetting Symbol.species, letting a custom Promise capture a raw host RangeError. Attackers must already control JavaScript evaluated inside a vm2 sandbox, after which the host process and its command-execution facilities become accessible.

CVSS severity10.0
Critical
EPSS probability0.76%
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 attackers to execute arbitrary commands on the host through crafted sandbox code. The localPromise constructor invokes the host Promise.prototype.then without resetting Symbol.species, letting a custom Promise capture a raw host RangeError. Attackers must already control JavaScript evaluated inside a vm2 sandbox, after which the host process and its command-execution facilities become accessible.

The record

CVE
CVE-2026-47208
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

10.0GitHub, Inc.CVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
T1059.007Command and Scripting Interpreter: JavaScript/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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