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CVE-2026-5422

MEDIUM Exploitation: PoC
6.8
CVSS 3.0
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.

Metadata

CVE ID
CVE-2026-5422
State
PUBLISHED
Assigner
@huntr_ai
Reserved
2026-04-02 12:44 UTC
Published
2026-06-02 09:11 UTC
Last updated
2026-06-02 12:14 UTC
Primary CWE
CWE-23
CWE-23 Relative Path Traversal
Vendor / Product
jupyter / jupyter/jupyter
Sources
cve.org  ·  NVD

Severity & Metrics

6.8 MEDIUM CVSS 3.0
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
jupyter jupyter/jupyter — unspecified ≤ latest
Weakness (CWE)
CWESourceDescription
CWE-23 cna CWE-23 Relative Path Traversal
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.8 MEDIUM 3.0 cna CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
References (1)
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