nbconvert: The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates
CVE-2026-39378 is fixed in nbconvert on 1 platform, first by DEBIAN-CVE-2026-39378, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| nbconvert · Debian 13.5 (trixie) | 7.16.6-1+deb13u1 | DEBIAN-CVE-2026-39378 | May 15, 2026 |
| nbconvert · Debian 14 | 7.17.1-1 | DEBIAN-CVE-2026-39378 | May 15, 2026 |
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