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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.

nbviewer 在 1.0.1 及之前版本中存在路径遍历漏洞。该漏洞位于 函数中，其使用字符串前缀比较而非正确的路径验证机制。攻击者可以通过请求与配置根目录共享文本前缀的路径，读取根目录之外的同级目录中的文件，从而泄露未预期的笔记本文件和凭据。

CVSS 5.9 · Medium

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

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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