FKIE_CVE-2026-25586

Vulnerability from fkie_nvd - Published: 2026-02-06 20:16 - Updated: 2026-02-18 14:32
Severity ?
10.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Summary
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty on a sandbox object, which disables prototype whitelist enforcement in the property-access path. This permits direct access to __proto__ and other blocked prototype properties, enabling host Object.prototype pollution and persistent cross-sandbox impact. This vulnerability is fixed in 0.8.29.
References
security-advisories@github.comhttps://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3Patch
security-advisories@github.comhttps://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48Exploit, Vendor Advisory
Impacted products
Vendor Product Version
nyariv sandboxjs *
To clipboard 

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              "criteria": "cpe:2.3:a:nyariv:sandboxjs:*:*:*:*:*:node.js:*:*",
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  "descriptions": [
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      "lang": "en",
      "value": "SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty on a sandbox object, which disables prototype whitelist enforcement in the property-access path. This permits direct access to __proto__ and other blocked prototype properties, enabling host Object.prototype pollution and persistent cross-sandbox impact. This vulnerability is fixed in 0.8.29."
    },
    {
      "lang": "es",
      "value": "SandboxJS es una librer\u00eda de sandboxing de JavaScript. Antes de 0.8.29, es posible un escape del sandbox al sombrear hasOwnProperty en un objeto sandbox, lo que deshabilita la aplicaci\u00f3n de la lista blanca de prototipos en la ruta de acceso a propiedades. Esto permite el acceso directo a __proto__ y otras propiedades de prototipo bloqueadas, lo que permite la contaminaci\u00f3n del Object.prototype del host y un impacto persistente entre sandboxes. Esta vulnerabilidad est\u00e1 corregida en 0.8.29."
    }
  ],
  "id": "CVE-2026-25586",
  "lastModified": "2026-02-18T14:32:36.463",
  "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,
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  "published": "2026-02-06T20:16:10.770",
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      "tags": [
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "CWE-74"
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      "source": "security-advisories@github.com",
      "type": "Secondary"
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}


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