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CVE-2026-35397— jupyter-server path traversal allows access to sibling directories sharing root_dir name prefix

Quick assessment

Affected
jupyter-server jupyter_server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Jupyter Server是Jupyter组织的一款用于为Jupyter Web应用提供后端服务的应用软件。 Jupyter Server 2.17.0及之前版本存在路径遍历漏洞，该漏洞源于REST API中的路径遍历问题，可能导致经过身份验证的用户逃离配置的root_dir并访问名称以root_dir前缀开头的同级目录。以下版本受到影响：2.17.0及之前版本。

CVSS 7.6 · High EPSS 0.67% · P50

Affected Version Matrix 1

VendorProduct Version RangeStatus
jupyter-server jupyter_server < 2.18.0 affected
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I. Basic Information for CVE-2026-35397

Vulnerability Information
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Vulnerability Title
jupyter-server path traversal allows access to sibling directories sharing root_dir name prefix
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Jupyter Server 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jupyter Server是Jupyter组织的一款用于为Jupyter Web应用提供后端服务的应用软件。 Jupyter Server 2.17.0及之前版本存在路径遍历漏洞，该漏洞源于REST API中的路径遍历问题，可能导致经过身份验证的用户逃离配置的root_dir并访问名称以root_dir前缀开头的同级目录。以下版本受到影响：2.17.0及之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jupyter-server jupyter_server < 2.18.0 -

II. Public POCs for CVE-2026-35397

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III. Intelligence Information for CVE-2026-35397

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Vendor Advisories for CVE-2026-35397 (1)

Same Patch Batch · jupyter-server · 2026-05-05 · 4 CVEs total

CVE-2025-61669 jupyter_server next parameter open redirect can redirect users to external domains
CVE-2026-40110 jupyter-server CORS origin validation bypass via unanchored regex in allow_origin_pat
CVE-2026-40934 jupyter-server authentication cookies remain valid after password reset due to static cook

IV. Related Vulnerabilities

Same product: jupyter_server
Same vendor: jupyter-server
Same weakness: CWE-22

V. Comments for CVE-2026-35397

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