CVE-2026-39378

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Source
https://cve.org/CVERecord?id=CVE-2026-39378
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-39378.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-39378
Aliases
Downstream
Related
Published
2026-04-21T00:17:00.684Z
Modified
2026-04-24T12:16:06.151087Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N CVSS Calculator
Summary
nbconvert has an Arbitrary File Read via Path Traversal in HTMLExporter Image Embedding
Details

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.

Database specific 
{
    "cwe_ids": [
        "CWE-22",
        "CWE-73"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39378.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/jupyter/nbconvert

Affected ranges

Type
GIT
Repo
https://github.com/jupyter/nbconvert
Events
Introduced
8fa95b8756384fd4b29c932f345f8228073bacfa
Fixed
78ed30837a607deab7cf0a12dca072bf3f63417a
Database specific 
{
    "extracted_events": [
        {
            "introduced": "6.5"
        },
        {
            "fixed": "7.17.1"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

6.*
6.5
7.*
7.0.0
7.0.0rc0
7.0.0rc1
7.0.0rc2
7.0.0rc3
7.1.0
v7.*
v7.10.0
v7.11.0
v7.12.0
v7.13.0
v7.13.1
v7.14.0
v7.14.1
v7.14.2
v7.15.0
v7.16.0
v7.16.1
v7.16.2
v7.16.3
v7.16.4
v7.16.5
v7.16.6
v7.17.0
v7.2.0
v7.2.1
v7.2.10
v7.2.2
v7.2.3
v7.2.4
v7.2.5
v7.2.6
v7.2.7
v7.2.8
v7.2.9
v7.3.0
v7.3.1
v7.4.0
v7.5.0
v7.6.0
v7.7.0
v7.7.1
v7.7.2
v7.7.3
v7.7.4
v7.8.0
v7.9.0
v7.9.1
v7.9.2

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-39378.json"