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CVE-2026-5422

Path Traversal in jupyter/jupyter

Published: Jun 2, 2026Updated: Jul 22, 2026 Sources: CVE List NVDCWE-23
8.1HIGH
NVD MITRE
EPSS Score
0.4%
Top 64.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-23

Affected Products

jupyter
oss-projectaka notebook, jupyterlab, jupyter server
jupyter serverOn-premWeb App
AI / ML / notebook-mlops
jupyter/jupyterOn-prem
AI / ML / notebook-mlops

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Discovery
View detailed technique mapping

References

https://huntr.com/bounties/24a36953-6490-466f-8cb2-a90d1ca56e0f
huntr.com

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