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.

INFO

Published Date :

2026-04-21T00:17:00.684Z

Last Modified :

2026-04-21T13:43:29.081Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-39378 vulnerability.

Vendors Products
Jupyter
  • Nbconvert
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-39378.

URL Resource
https://github.com/jupyter/nbconvert/releases/tag/v7.17.1 cve-icon cve-icon cve-icon
https://github.com/jupyter/nbconvert/security/advisories/GHSA-7jqv-fw35-gmx9 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-39378 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-39378 cve-icon
Login to claim this CVE

CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact