GHSA-7jqv-fw35-gmx9 — nbconvert has an Arbitrary File Read via Path Traversal in HTMLExporter Image Embedding

Affected: PyPI: nbconvert

## Summary

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.

## Patches

Upgrade to nbconvert 7.17.1

## Workarounds

Do not enable `HTMLExporter.embed_images` (it is not enabled by default).

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GHSA-7jqv-fw35-gmx9 — nbconvert has an Arbitrary File Read via Path Traversal in HTMLExporter Image Embedding