A path traversal vulnerability exists in jupyter-server version 2.17.0 due to an incorrect root directory boundary check in the _get_os_path() function within jupyter_server/services/contents/fileio.py. The check uses startswith(root) without appending a trailing path separator, allowing sibling directories with names starting with the same prefix as root_dir to bypass the check. Additionally, the to_os_path() function in utils.py does not strip ".." from path parts, enabling traversal sequences to bypass the vulnerable check. This vulnerability can lead to unauthorized read/write access to files in sibling directories, potentially exposing sensitive data in shared hosting environments.

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History

Tue, 02 Jun 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Jupyter
Jupyter jupyter Server
Vendors & Products Jupyter
Jupyter jupyter Server

Tue, 02 Jun 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 02 Jun 2026 10:00:00 +0000

Type Values Removed Values Added
Description A path traversal vulnerability exists in jupyter-server version 2.17.0 due to an incorrect root directory boundary check in the _get_os_path() function within jupyter_server/services/contents/fileio.py. The check uses startswith(root) without appending a trailing path separator, allowing sibling directories with names starting with the same prefix as root_dir to bypass the check. Additionally, the to_os_path() function in utils.py does not strip ".." from path parts, enabling traversal sequences to bypass the vulnerable check. This vulnerability can lead to unauthorized read/write access to files in sibling directories, potentially exposing sensitive data in shared hosting environments.
Title Path Traversal in jupyter/jupyter
Weaknesses CWE-23
References
Metrics cvssV3_0

{'score': 6.8, 'vector': 'CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: @huntr_ai

Published:

Updated: 2026-06-02T12:14:02.747Z

Reserved: 2026-04-02T12:44:03.302Z

Link: CVE-2026-5422

cve-icon Vulnrichment

Updated: 2026-06-02T12:12:01.952Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-06-02T10:16:25.800

Modified: 2026-06-02T14:35:45.167

Link: CVE-2026-5422

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-02T14:45:10Z

Weaknesses