Langflow – Path Traversal Arbitrary File Write via upload_user_file_CVE-2026-5027

{
    "lastseen": "",
    "description": "The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').",
    "published": "2026-03-27T14:54:53.609Z",
    "modified": "2026-03-27T15:11:42.918Z",
    "type": "cve",
    "title": "Langflow - Path Traversal Arbitrary File Write via upload_user_file",
    "source": "tenable",
    "references": "https://www.tenable.com/security/research/tra-2026-26",
    "id": "CVE-2026-5027",
    "bulletinFamily": "",
    "cwe": [
        "CWE-22"
    ],
    "cvelist": null,
    "sourceData": "langflow-ai langflow 0",
    "sourceHref": "",
    "cvss": {
        "score": 8.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
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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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            "privilegesRequired": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "langflow",
    "version": "0",
    "vendor": "langflow-ai",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
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    "ai_version": "",
    "ai_score": 0
}