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Vulnerability record · CVE-2026-39378 · published 21 April 2026

CVE-2026-39378: Jupyter nbconvert path traversal vulnerability

Jupyter · Nbconvert

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.

6.5 CVSS 3.1 Medium EPSS 0.46% · top 62.9% CWE-22 · Path traversalCWE-73 · CWE-73
6.5CVSS 3.1 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/jupyter/nbconvert/releases/tag/v7.17.1 Product
https://github.com/jupyter/nbconvert/security/advisories/GHSA-7jqv-fw35-gmx9 MitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-39378), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.