Svelte SSR attribute spreading includes inherited properties from prototype chain_CVE-2026-27125

{
    "lastseen": "",
    "description": "svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements (e.g. <div {...attrs}>) enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted \u2014 a precondition outside of Svelte's control \u2014 this can cause unexpected attributes to appear in SSR output or cause SSR to throw errors. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.",
    "published": "2026-02-20T22:29:45.364Z",
    "modified": "2026-02-20T22:29:45.364Z",
    "type": "cve",
    "title": "Svelte SSR attribute spreading includes inherited properties from prototype chain",
    "source": "GitHub_M",
    "references": "https://github.com/sveltejs/svelte/security/advisories/GHSA-crpf-4hrx-3jrp\nhttps://github.com/sveltejs/svelte/commit/73098bb26c6f06e7fd1b0746d817d2c5ee90755f\nhttps://github.com/sveltejs/svelte/releases/tag/[email protected]",
    "id": "CVE-2026-27125",
    "bulletinFamily": "",
    "cwe": [
        "CWE-915"
    ],
    "cvelist": null,
    "sourceData": "sveltejs svelte < 5.51.5",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:H/SI:H/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
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        "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": "svelte",
    "version": "< 5.51.5",
    "vendor": "sveltejs",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
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    "ai_score": 0
}