Path Traversal in jupyter/jupyter

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Summary

CVECVE-2026-5422
StatePUBLISHED
Assigner@huntr_ai
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-02 10:16:25 UTC
Updated2026-06-03 17:09:31 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.000460000 probability, percentile 0.144900000 (date 2026-06-02)

Problem Types: CWE-23 | CWE-23 CWE-23 Relative Path Traversal

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.0[email protected]Secondary6.8MEDIUMCVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
3.0CNADECLARED6.8MEDIUMCVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Jupyter Jupyter Server 2.17.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Jupyter Jupyter/jupyter affected unspecified latest custom Not specified

References

ReferenceSourceLinkTags
huntr.com/bounties/24a36953-6490-466f-8cb2-a90d1ca56e0f 134c704f-9b21-4f2e-91b3-4a467353bcc0 huntr.com Exploit, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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