GHSA-7jqv-fw35-gmx9
nbconvert has an Arbitrary File Read via Path Traversal in HTMLExporter Image Embedding
At a glance
- Published
- Updated
- CVE
- CVE-2026-39378
- Aliases
- PYSEC-2026-2230
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Description
## 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).
Affected packages
| Package | Versions |
|---|---|
| PyPI · nbconvert | introduced 6.5.0, fixed 7.17.1 |
References
- https://github.com/jupyter/nbconvert/security/advisories/GHSA-7jqv-fw35-gmx9 WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-39378 ADVISORY
- https://github.com/jupyter/nbconvert PACKAGE
- https://github.com/jupyter/nbconvert/releases/tag/v7.17.1 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |