CVE-2026-47135Public exploitNetwork attack vector

Host behavior manipulation via cross-realm symbols

Published Jun 12, 2026 · Updated Jun 12, 2026

Sandbox escape in Patrik Simek vm2 before 3.11.4 allows attackers to alter host-side behavior through cross-realm symbols. The Symbol.for override exposes Node.js symbols, while bridge set, defineProperty, and deleteProperty traps accept those keys on host objects. Reachability requires attacker-controlled code in a vm2 sandbox with a non-protected host object; the demonstrated result is host data-integrity loss, not direct code execution.

CVSS severity8.7
High
EPSS probability0.27%
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 alter host-side behavior through cross-realm symbols. The Symbol.for override exposes Node.js symbols, while bridge set, defineProperty, and deleteProperty traps accept those keys on host objects. Reachability requires attacker-controlled code in a vm2 sandbox with a non-protected host object; the demonstrated result is host data-integrity loss, not direct code execution.

The record

CVE
CVE-2026-47135
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
Patrik Simek
Product
vm2
Classifications
CWE-693
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

8.7GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/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

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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