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CVE-2026-86258— nbviewer through 1.0.1 Path Traversal via LocalFileHandler

Quick assessment

Affected
jupyter nbviewer
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 Notebook Viewer是Jupyter组织开源的一个将数据笔记本转换为网页形式的工具。 Jupyter Notebook Viewer 1.0.1及之前版本存在路径遍历漏洞，该漏洞源于LocalFileHandler.can_show()使用字符串前缀比较而非正确的路径验证，可能导致攻击者通过请求共享根文本前缀的路径读取配置根目录之外兄弟目录中的文件，泄露未预期的笔记本和凭据。

CVSS 5.9 · Medium EPSS 0.52% · P43

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
jupyter nbviewer ≤ 1.0.1 affected
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I. Basic Information for CVE-2026-86258

Vulnerability Information
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Vulnerability Title
nbviewer through 1.0.1 Path Traversal via LocalFileHandler
Source: CVE Program / CVE List V5
Vulnerability Description
nbviewer through 1.0.1 contains a path traversal vulnerability in LocalFileHandler.can_show() that uses string-prefix comparison instead of proper path validation. Attackers can read files from sibling directories outside the configured root by requesting paths that share the root as a textual prefix, disclosing unintended notebooks and credentials.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A: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 Notebook Viewer 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jupyter Notebook Viewer是Jupyter组织开源的一个将数据笔记本转换为网页形式的工具。 Jupyter Notebook Viewer 1.0.1及之前版本存在路径遍历漏洞，该漏洞源于LocalFileHandler.can_show()使用字符串前缀比较而非正确的路径验证，可能导致攻击者通过请求共享根文本前缀的路径读取配置根目录之外兄弟目录中的文件，泄露未预期的笔记本和凭据。
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 nbviewer 0 ~ 1.0.1 -

II. Public POCs for CVE-2026-86258

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III. Intelligence Information for CVE-2026-86258

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Patches & Fixes for CVE-2026-86258 (3)

Vendor Advisories for CVE-2026-86258 (1)

Proof of Concept for CVE-2026-86258 (1)

IV. Related Vulnerabilities

Same vendor: jupyter
Same weakness: CWE-22

V. Comments for CVE-2026-86258

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