Vulnerability Description
The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. From 5.4.0 until 7.17.2, ExtractOutputPreprocessor in nbconvert/preprocessors/extractoutput.py joins the attacker-controlled cell output metadata filename to output_files_dir without limiting the result to the intended directory. When a victim converts a malicious notebook with the markdown, LaTeX, reStructuredText, or AsciiDoc exporter, path traversal in the output filename can write attacker-controlled output data to arbitrary locations accessible to the victim. Running the notebook cell again replaces the malicious output metadata, but merely converting the supplied notebook does not. This issue is fixed in version 7.17.2.
Related Weaknesses (CWE)
References
- https://github.com/jupyter/nbconvert/commit/ce4bd99aec31d81d759fa8eeb8643179392e
- https://github.com/jupyter/nbconvert/releases/tag/v7.17.2
- https://github.com/jupyter/nbconvert/security/advisories/GHSA-pjvx-prjx-h659
- https://github.com/jupyter/nbconvert/security/advisories/GHSA-pjvx-prjx-h659
FAQ
What is CVE-2026-114140?
CVE-2026-114140 is a documented vulnerability. The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. From 5.4.0 until 7.17.2, ExtractOutputPreprocessor in nbconvert/preprocessors/extractout...
How severe is CVE-2026-114140?
CVSS scoring is not yet available for CVE-2026-114140. Check NVD for updates.
Is there a patch for CVE-2026-114140?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.