6.5
Medium
CVE-2026-39378 The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| nbconvert 6.5 | 6.5 → < 7.17.1 | 7.17.1 |
Other CVEs of nbconvert
The 5 CVEs of nbconvert →
CVE-2026-114140
The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates
8.8
High
CVE-2026-39377
The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates
6.5
Medium
CVE-2025-53000
The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates
8.5
High
CVE-2021-32862
The GitHub Security Lab discovered sixteen ways to exploit a cross-site scripting vulnerability in nbconvert
7.5
High