Starlette vulnerable to O(n^2) DoS via Range header merging in starlette.responses.FileResponse_CVE-2025-62727

{
    "lastseen": "",
    "description": "Starlette is a lightweight ASGI framework/toolkit. Prior to 0.49.1 , an unauthenticated attacker can send a crafted HTTP Range header that triggers quadratic-time processing in Starlette's FileResponse Range parsing/merging logic. This enables CPU exhaustion per request, causing denial\u2011of\u2011service for endpoints serving files (e.g., StaticFiles or any use of FileResponse). This vulnerability is fixed in 0.49.1.",
    "published": "2025-10-28T20:14:53.655Z",
    "modified": "2025-10-28T20:36:49.189Z",
    "type": "cve",
    "title": "Starlette vulnerable to O(n^2) DoS via Range header merging in starlette.responses.FileResponse",
    "source": "GitHub_M",
    "references": "https://github.com/Kludex/starlette/security/advisories/GHSA-7f5h-v6xp-fcq8\nhttps://github.com/Kludex/starlette/commit/4ea6e22b489ec388d6004cfbca52dd5b147127c5",
    "id": "CVE-2025-62727",
    "bulletinFamily": "",
    "cwe": [
        "CWE-407"
    ],
    "cvelist": null,
    "sourceData": "Kludex starlette < 0.49.1",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "starlette",
    "version": "< 0.49.1",
    "vendor": "Kludex",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}