CVE-2026-5422

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.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://huntr.com/bounties/24a36953-6490-466f-8cb2-a90d1ca56e0f	Exploit Third Party Advisory
https://huntr.com/bounties/24a36953-6490-466f-8cb2-a90d1ca56e0f	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:jupyter:jupyter_server:2.17.0:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-06-02 10:16

Updated : 2026-07-22 19:10

NVD link : CVE-2026-5422

Mitre link : CVE-2026-5422

CVE.ORG link : CVE-2026-5422

JSON object : View

Products Affected

jupyter

jupyter_server

CWE

CWE-23

Relative Path Traversal

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