CVE-2026-86258

MediumCVSS 5.9/10Last modified Sep 10, 2026

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.

Metrics

CVSS 3.1 5.9/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-22

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
jupyter	nbviewer	<= 1.0.1

References

Timeline

Published: Sep 6, 2026
Last modified: Sep 10, 2026
NVD status: Awaiting Analysis

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