nbconvert: The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates
CVE-2026-39377 is fixed in nbconvert on 1 platform, first by DEBIAN-CVE-2026-39377, 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. Versions 6.5 through 7.17.0 allow arbitrary file writes to locations outside the intended output directory when processing notebooks containing crafted cell attachment filenames. The `ExtractAttachmentsPreprocessor` passes attachment filenames directly to the filesystem without sanitization, enabling path traversal attacks. This vulnerability provides complete control over both the destination path and file extension. Version 7.17.1 contains a patch.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| nbconvert · Debian 13.5 (trixie) | 7.16.6-1+deb13u1 | DEBIAN-CVE-2026-39377 | May 15, 2026 |
| nbconvert · Debian 14 | 7.17.1-1 | DEBIAN-CVE-2026-39377 | May 15, 2026 |
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