SandboxJS has a Sandbox Escape via Prototype Whitelist Bypass and Host Prototype Pollution_CVE-2026-25586

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-02-06T19:54:38.446Z",
    "modified": "2026-02-06T20:17:19.095Z",
    "type": "cve",
    "title": "SandboxJS has a Sandbox Escape via Prototype Whitelist Bypass and Host Prototype Pollution",
    "source": "GitHub_M",
    "references": "https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48\nhttps://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3",
    "id": "CVE-2026-25586",
    "bulletinFamily": "",
    "cwe": [
        "CWE-74"
    ],
    "cvelist": null,
    "sourceData": "nyariv SandboxJS < 0.8.29",
    "sourceHref": "",
    "cvss": {
        "score": 10,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "SandboxJS",
    "version": "< 0.8.29",
    "vendor": "nyariv",
    "ai_description": "Sandbox escape via prototype whitelist bypass and host prototype pollution",
    "ai_severity": "Critical",
    "ai_vendor": "nyariv",
    "ai_product": "SandboxJS",
    "ai_version": "< 0.8.29",
    "ai_score": 10
}