Python-Multipart: Negative Content-Length in parse_form buffers the entire body in memory_CVE-2026-53540

{
    "lastseen": "",
    "description": "Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.31, parse_form() did not validate the Content-Length header before using it to bound its chunked read of the request body. A negative Content-Length turned the bounded read into a read-until-EOF, so the entire body was loaded into memory in a single read instead of in fixed-size chunks. This vulnerability is fixed in 0.0.31.",
    "published": "2026-06-22T16:58:54.923Z",
    "modified": "2026-06-22T16:58:54.923Z",
    "type": "cve",
    "title": "Python-Multipart: Negative Content-Length in parse_form buffers the entire body in memory",
    "source": "GitHub_M",
    "references": "https://github.com/Kludex/python-multipart/security/advisories/GHSA-v9pg-7xvm-68hf",
    "id": "CVE-2026-53540",
    "bulletinFamily": "",
    "cwe": [
        "CWE-1284"
    ],
    "cvelist": null,
    "sourceData": "Kludex python-multipart < 0.0.31",
    "sourceHref": "",
    "cvss": {
        "score": 3.7,
        "severity": "LOW",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "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": "python-multipart",
    "version": "< 0.0.31",
    "vendor": "Kludex",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}