---
title: "CVE-2026-114140: Jupyter nbconvert - Path Traversal"
description: "Jupyter nbconvert 5.4.0 to < 7.17.2 contains a path traversal caused by improper sanitization of output metadata filenames in ExtractOutputPreprocessor, letting attackers write files to arbitrary locations during notebook conversion, exploit requires victim to convert a malicious notebook."
url: https://panop.io/threat-heartbeat/CVE-2026-114140/
---

# CVE-2026-114140 Jupyter nbconvert - Path Traversal

Jupyter nbconvert 5.4.0 to < 7.17.2 contains a path traversal caused by improper sanitization of output metadata filenames in ExtractOutputPreprocessor, letting attackers write files to arbitrary locations during notebook conversion, exploit requires victim to convert a malicious notebook.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-114140)

## Details

Type

Path Traversal

Impact

Data Tampering

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

21 October 2026

Updated

22 October 2026

Weakness

[CWE-22](https://cwe.mitre.org/data/definitions/22.html)

## Vendor fix

Upgrade to version 7.17.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-114140](https://nvd.nist.gov/vuln/detail/CVE-2026-114140)
- [https://github.com/jupyter/nbconvert/security/advisories/GHSA-pjvx-prjx-h659](https://github.com/jupyter/nbconvert/security/advisories/GHSA-pjvx-prjx-h659)
- [https://github.com/jupyter/nbconvert/commit/ce4bd99aec31d81d759fa8eeb8643179392ec66f](https://github.com/jupyter/nbconvert/commit/ce4bd99aec31d81d759fa8eeb8643179392ec66f)
- [https://github.com/jupyter/nbconvert/releases/tag/v7.17.2](https://github.com/jupyter/nbconvert/releases/tag/v7.17.2)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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