CVE-2026-114140

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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/jupyter/nbconvert/commit/ce4bd99aec31d81d759fa8eeb8643179392ec66f
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

Configurations

No configuration.

History

30 Oct 2026, 15:16

Type	Values Removed	Values Added
References	~~() https://github.com/jupyter/nbconvert/security/advisories/GHSA-pjvx-prjx-h659 -~~	() https://github.com/jupyter/nbconvert/security/advisories/GHSA-pjvx-prjx-h659 -

21 Oct 2026, 21:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-21 21:17

Updated : 2026-10-30 15:16

NVD link : CVE-2026-114140

Mitre link : CVE-2026-114140

CVE.ORG link : CVE-2026-114140

JSON object : View

Products Affected

No product.

CWE

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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