MEDIUM 6.5
PYSEC-2026-2230
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.
Are you affected?
Enter the version of the package you're using.
Affected packages
PyPI / nbconvert
Introduced in:
6.5.0 Fixed in: 7.17.1 Fix
pip install --upgrade 'nbconvert>=7.17.1'