nbconvert has an Arbitrary File Read via Path Traversal in HTMLExporter Image Embedding_CVE-2026-39378

{
    "lastseen": "",
    "description": "The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. In versions 6.5 through 7.17.0, when `HTMLExporter.embed_images=True`, nbconvert's markdown renderer allows arbitrary file read via path traversal in image references. A malicious notebook can exfiltrate sensitive files from the conversion host by embedding them as base64 data URIs in the output HTML. nbconvert 7.17.1 contains a fix. As a workaround, do not enable `HTMLExporter.embed_images`; it is not enabled by default.",
    "published": "2026-04-21T00:17:00.684Z",
    "modified": "2026-04-21T00:17:00.684Z",
    "type": "cve",
    "title": "nbconvert has an Arbitrary File Read via Path Traversal in HTMLExporter Image Embedding",
    "source": "GitHub_M",
    "references": "https://github.com/jupyter/nbconvert/security/advisories/GHSA-7jqv-fw35-gmx9\nhttps://github.com/jupyter/nbconvert/releases/tag/v7.17.1",
    "id": "CVE-2026-39378",
    "bulletinFamily": "",
    "cwe": [
        "CWE-22",
        "CWE-73"
    ],
    "cvelist": null,
    "sourceData": "jupyter nbconvert >= 6.5, < 7.17.1",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "nbconvert",
    "version": ">= 6.5, < 7.17.1",
    "vendor": "jupyter",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}