Langflow: Unauthenticated DoS through multipart form boundary file upload_CVE-2026-55446

{
    "lastseen": "",
    "description": "Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an indefinite amount of time. This vulnerability is fixed in 1.0.19.",
    "published": "2026-06-23T16:26:17.990Z",
    "modified": "2026-06-23T17:56:37.766Z",
    "type": "cve",
    "title": "Langflow: Unauthenticated DoS through multipart form boundary file upload",
    "source": "GitHub_M",
    "references": "https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9\nhttps://github.com/langflow-ai/langflow/pull/3923",
    "id": "CVE-2026-55446",
    "bulletinFamily": "",
    "cwe": [
        "CWE-400"
    ],
    "cvelist": null,
    "sourceData": "langflow-ai langflow < 1.0.19",
    "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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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "langflow",
    "version": "< 1.0.19",
    "vendor": "langflow-ai",
    "ai_description": "",
    "ai_severity": "",
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    "ai_product": "",
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    "ai_score": 0
}