Path Traversal in jupyter/jupyter_CVE-2026-5422

{
    "lastseen": "",
    "description": "A path traversal vulnerability exists in jupyter-server version 2.17.0 due to an incorrect root directory boundary check in the _get_os_path() function within jupyter_server/services/contents/fileio.py. The check uses startswith(root) without appending a trailing path separator, allowing sibling directories with names starting with the same prefix as root_dir to bypass the check. Additionally, the to_os_path() function in utils.py does not strip \"..\" from path parts, enabling traversal sequences to bypass the vulnerable check. This vulnerability can lead to unauthorized read/write access to files in sibling directories, potentially exposing sensitive data in shared hosting environments.",
    "published": "2026-06-02T09:11:15.755Z",
    "modified": "2026-06-02T09:11:15.755Z",
    "type": "cve",
    "title": "Path Traversal in jupyter/jupyter",
    "source": "@huntr_ai",
    "references": "https://huntr.com/bounties/24a36953-6490-466f-8cb2-a90d1ca56e0f",
    "id": "CVE-2026-5422",
    "bulletinFamily": "",
    "cwe": [
        "CWE-23"
    ],
    "cvelist": null,
    "sourceData": "jupyter jupyter/jupyter unspecified",
    "sourceHref": "",
    "cvss": {
        "score": 6.8,
        "severity": "MEDIUM",
        "vector": "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
        "version": "3.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "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": "jupyter/jupyter",
    "version": "unspecified",
    "vendor": "jupyter",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}