CVE-2026-92958Public exploitNetwork attack vector

Host filesystem writes via builtin subpath bypass

Published Sep 17, 2026 · Updated Sep 18, 2026

Sandbox escape in Patrik Simek vm2 3.11.6 and earlier allows remote authenticated users to write host files through sandboxed NodeVM code. In lib/builtin.js, wildcard exclusions compare exact module names, so denying fs leaves fs/promises and node:fs/promises accessible. Exploitation requires a NodeVM using the builtin wildcard with a negative fs entry; successful access permits host file creation, modification, reading, or deletion.

CVSS severity8.5
High
EPSS probability0.38%
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 3.11.6 and earlier allows remote authenticated users to write host files through sandboxed NodeVM code. In lib/builtin.js, wildcard exclusions compare exact module names, so denying fs leaves fs/promises and node:fs/promises accessible. Exploitation requires a NodeVM using the builtin wildcard with a negative fs entry; successful access permits host file creation, modification, reading, or deletion.

The record

CVE
CVE-2026-92958
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
Patrik Simek
Product
vm2
Classifications
CWE-284, CWE-269, CWE-1220, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <3.11.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Patrik Simek · vm2version=0 <3.11.7

Published CVSS scores

8.5GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L
8.5Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-269Improper Privilege Management
CWE-1220Insufficient Granularity of Access Control
T1565.001Stored Data Manipulation

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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