js-yaml has prototype pollution in merge (<<)_CVE-2025-64718

{
    "lastseen": "",
    "description": "js-yaml is a JavaScript YAML parser and dumper. In js-yaml 4.1.0 and below, it's possible for an attacker to modify the prototype of the result of a parsed yaml document via prototype pollution (`__proto__`). All users who parse untrusted yaml documents may be impacted. The problem is patched in js-yaml 4.1.1. Users can protect against this kind of attack on the server by using `node --disable-proto=delete` or `deno` (in Deno, pollution protection is on by default).",
    "published": "2025-11-13T15:32:44.634Z",
    "modified": "2025-11-13T16:18:39.270Z",
    "type": "cve",
    "title": "js-yaml has prototype pollution in merge (<<)",
    "source": "GitHub_M",
    "references": "https://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8m\nhttps://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879",
    "id": "CVE-2025-64718",
    "bulletinFamily": "",
    "cwe": [
        "CWE-1321"
    ],
    "cvelist": null,
    "sourceData": "nodeca js-yaml < 4.1.1",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "js-yaml",
    "version": "< 4.1.1",
    "vendor": "nodeca",
    "ai_description": "",
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    "ai_score": 0
}