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CVE-2026-5422

8.1 HIGH

A path traversal vulnerability exists in jupyter-server version 2.17.0 due to an incorrect root directory boundary check in the _get_os_p...

Published: 2026-06-02 · Last updated: 2026-06-03

Severity and scoring

CVSS
8.1 HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE
CWE-23

Affected products

VendorProduct
jupyterjupyter_server

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.

Source: NVD

References

Related CVEs

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  • CVE-2026-42266 — JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture (8.8 HIGH)

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  • CVE-2026-10074 — DreamMaker developed by Interinfo has an Arbitrary File Read vulnerability, allowing privileged local attackers to exploit Relative Path ... (4.9 MEDIUM)
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