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

Posted on September 7, 2026
CVE ID :CVE-2026-86258

Published : Sept. 6, 2026, 1:17 p.m. | 11 hours, 35 minutes ago

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.

Severity: 8.2 | HIGH

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