CVE-2026-35397

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Source
https://cve.org/CVERecord?id=CVE-2026-35397
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35397.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-35397
Aliases
Downstream
Related
Published
2026-05-05T19:37:33Z
Modified
2026-09-05T11:45:12Z
Severity
  • 7.6 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N CVSS Calculator
Summary
jupyter-server path traversal allows access to sibling directories sharing root_dir name prefix
Details

Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, a path traversal vulnerability in the REST API allows an authenticated user to escape the configured root_dir and access sibling directories whose names begin with the same prefix as the root_dir. For example, with a root_dir named "test", the API permits access to a sibling directory named "testtest" through a crafted request to the /api/contents endpoint using encoded path components. An attacker can read, write, and delete files in affected sibling directories. Multi-tenant deployments using predictable naming schemes are particularly at risk, as a user with a directory named "user1" could access directories for user10 through user19 and beyond. A user who can choose a single-character folder name could gain access to a significant number of sibling directories.

Version 2.18.0 contains a fix. As a workaround, ensure folder names do not share a common prefix with any sibling directory.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-22"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35397.json"
}
References

Affected packages

Git / github.com/jupyter-server/jupyter_server

Affected ranges

Type
GIT
Repo
https://github.com/jupyter-server/jupyter_server
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
86db95fc346fc1ba2f3ae3aa4c2c1f0f7a03cc56
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:jupyter:jupyter_server:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.18.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35397.json"