CVE-2026-92947: vm2 Sandboxed Code Can Read And Vulnerability
CRITICALCVE-2026-92947 is a CRITICAL (CVSS 10.0) sandboxed code can read and vulnerability (CWE-668: Exposure of Resource to Wrong Sphere) affecting vm2 libraries in the npm ecosystem. The issue involves sandboxed code can read and write host-realm memory via node's shared buffer pool. Remediation is available by upgrading affected packages to version 3.11.7.
CVE-2026-92947 at a Glance
Security Impact
CVSS: 10.0
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L).
How to Fix CVE-2026-92947
To remediate this vulnerability, upgrade all affected vm2 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
npm install vm2@3.11.7Run the following command in your project directory to verify that all resolved dependencies use the patched release:
npm ls vm2How to Check if You Are Affected
To determine whether your Node.js application is affected by CVE-2026-92947, inspect your project dependencies using npm:
npm ls vm2Analyze the terminal output to locate any version of vm2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.11.7), your application is affected.
Note: The npm ls vm2 command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-668: Exposure of Resource to Wrong Sphere, where the product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource. In vm2, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-92947 Affected vm2 Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
vm2
|
npm |
< 3.11.7
|
3.11.7
|
References
Frequently Asked Questions
What is CVE-2026-92947?
Which vm2 versions are affected?
What version fixes CVE-2026-92947?
Is vm2 affected?
What is the CVSS score of CVE-2026-92947?
What CWE is associated with CVE-2026-92947?
How can I check npm dependencies for CVE-2026-92947?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-fcqc-726x-5wfc",
"modified" : "2026-10-05T22:34:35Z",
"published" : "2026-10-05T22:34:35Z",
"aliases" : [ "CVE-2026-92947" ],
"summary" : "vm2: Sandboxed code can read and write host-realm memory via Node's shared Buffer pool",
"details" : "### Summary\nSandboxed code is able to disclose host memory used by small allocations by `Buffer.from`, `Buffer.concat`.\n\n### Details\nvm2 exposes `Buffer` object to sandboxed code by default. Small [`Buffer` allocations](https://nodejs.org/api/buffer.html#static-method-bufferallocunsafesize) (for example, [Buffer.allocUnsafe()](https://nodejs.org/api/buffer.html#static-method-bufferallocunsafesize), [Buffer.from(array)](https://nodejs.org/api/buffer.html#static-method-bufferfromarray), [Buffer.from(string)](https://nodejs.org/api/buffer.html#static-method-bufferfromstring-encoding), and [Buffer.concat()](https://nodejs.org/api/buffer.html#static-method-bufferconcatlist-totallength)) use the same Buffer pool, which is shared with the sandbox. This allows sandboxed code to disclose host memory used by the functions listed above.\n\n### PoC\nTested against `vm2@3.11.5` in the node REPL.\n```javascript\nBuffer.from('host-memory-should-not-leak-to-sandbox')\nnew (require('vm2').VM)().run(`Buffer.from(Buffer.from([0]).buffer, 0, Buffer.from([0]).buffer.byteLength).toString('ascii')`)\n```\n\n<img width=\"1044\" height=\"104\" alt=\"Screenshot 2026-07-23 at 17 54 15\" src=\"https://github.com/user-attachments/assets/987b860c-6702-4818-bfaa-c77919c777e5\" />\n\n### Impact\nSince sandbox acquires an ArrayBuffer that is used by the host, it can disclose sensitive data going through functions mentioned above and even write to these buffers, which can lead to sensitive data exposure and potentially denial-of-service.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "npm",
"name" : "vm2"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "3.11.7"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 3.11.6"
}
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/patriksimek/vm2/security/advisories/GHSA-fcqc-726x-5wfc"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-92947"
}, {
"type" : "WEB",
"url" : "https://github.com/patriksimek/vm2/commit/4f2508abeb252aa86eb6761c78b3b000248fb089"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/patriksimek/vm2"
}, {
"type" : "WEB",
"url" : "https://github.com/patriksimek/vm2/releases/tag/v3.11.7"
}, {
"type" : "WEB",
"url" : "https://www.vulncheck.com/advisories/vm2-before-3.11.7-memory-disclosure-via-buffer-pool"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-200", "CWE-653", "CWE-668" ],
"severity" : "CRITICAL",
"github_reviewed" : true,
"github_reviewed_at" : "2026-10-05T22:34:35Z",
"nvd_published_at" : null
}
}