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.

• CWE-23

• https://huntr.com/bounties/24a36953-6490-466f-8cb2-a90d1ca56e0fExploit, Third Party Advisory
• https://huntr.com/bounties/24a36953-6490-466f-8cb2-a90d1ca56e0fExploit, Third Party Advisory

Published

Jun 2, 2026

Last Modified

Jul 22, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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