SEPTEMBER 17, 2026
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Case File

CVE-2026-86258

MEDIUM · CVSS 5.9 EPSS 0.36% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-06 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

The vulnerability in nbviewer versions up to 1.0.1 allows attackers to exploit a path traversal flaw in the LocalFileHandler.can_show() method, enabling unauthorized access to files in sibling directories outside the intended root. This could lead to the exposure of sensitive notebooks and credentials. Organizations using nbviewer should prioritize patching this vulnerability to mitigate potential data leaks.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

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CVE
CVE-2026-86258
Severity
MEDIUM
CVSS
5.9
EPSS
0.36%

Original NVD 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.