CVE-2026-86258: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in jupyter nbviewer
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.
CVE-2026-86258: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in jupyter nbviewer
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.
CVSS v4.0
Score 8.2high
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-06T11:35:19.317Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a9d621aacd9273b49c2097e
Added to database: 09/06/2026, 12:52:42 UTC
Last updated: 09/06/2026, 17:07:20 UTC
Views: 8
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