CVE-2026-93603Public exploitNetwork attack vector

Host code execution via nullish receiver leak

Published Sep 18, 2026 · Updated Sep 18, 2026

Sandbox escape in Patrik Simek vm2 through 3.12.0 allows attackers to execute arbitrary host code via a nullish function receiver. The apply trap in lib/bridge.js passes an undefined receiver into a non-strict host function, after which V8 substitutes the host global and vm2 wraps it for sandbox access. Exploitation requires an exposed non-strict host function; strict-mode and ES module functions are unaffected, while successful escape grants the sandbox access to process and host command execution.

CVSS severity10.0
Critical
EPSS probability0.73%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox escape in Patrik Simek vm2 through 3.12.0 allows attackers to execute arbitrary host code via a nullish function receiver. The apply trap in lib/bridge.js passes an undefined receiver into a non-strict host function, after which V8 substitutes the host global and vm2 wraps it for sandbox access. Exploitation requires an exposed non-strict host function; strict-mode and ES module functions are unaffected, while successful escape grants the sandbox access to process and host command execution.

The record

CVE
CVE-2026-93603
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Patrik Simek
Product
vm2
Classifications
CWE-913, CWE-94, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=0 <3.12.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Patrik Simek · vm2version=0 <3.12.1

Published CVSS scores

10.0VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
10.0VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA: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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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
CWE-94Improper Control of Generation of Code ('Code Injection')
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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