NiceGUI’s Path Traversal via Unsanitized FileUpload.name Enables Arbitrary File Write_CVE-2026-25732

{
    "lastseen": "",
    "description": "NiceGUI is a Python-based UI framework. Prior to 3.7.0, NiceGUI's FileUpload.name property exposes client-supplied filename metadata without sanitization, enabling path traversal when developers use the pattern UPLOAD_DIR / file.name. Malicious filenames containing ../ sequences allow attackers to write files outside intended directories, with potential for remote code execution through application file overwrites in vulnerable deployment patterns. This design creates a prevalent security footgun affecting applications following common community patterns. Note: Exploitation requires application code incorporating file.name into filesystem paths without sanitization. Applications using fixed paths, generated filenames, or explicit sanitization are not affected. This vulnerability is fixed in 3.7.0.",
    "published": "2026-02-06T21:09:58.389Z",
    "modified": "2026-02-06T21:09:58.389Z",
    "type": "cve",
    "title": "NiceGUI's Path Traversal via Unsanitized FileUpload.name Enables Arbitrary File Write",
    "source": "GitHub_M",
    "references": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-9ffm-fxg3-xrhh\nhttps://github.com/zauberzeug/nicegui/blob/main/nicegui/elements/upload_files.py#L110-L115\nhttps://github.com/zauberzeug/nicegui/blob/main/nicegui/elements/upload_files.py#L79-L82",
    "id": "CVE-2026-25732",
    "bulletinFamily": "",
    "cwe": [
        "CWE-22"
    ],
    "cvelist": null,
    "sourceData": "zauberzeug nicegui < 3.7.0",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
        "version": "3.1"
    },
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    "href": "",
    "category_name": "CVE",
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    "product": "nicegui",
    "version": "< 3.7.0",
    "vendor": "zauberzeug",
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