Unrated severityNVD Advisory· Published Sep 6, 2026
nbviewer through 1.0.1 Path Traversal via LocalFileHandler
CVE-2026-86258
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.
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Affected products
1Patches
Vulnerability mechanics
References
4- github.com/jupyter/nbviewer/commit/aad36106f72a1ca7721310c6fccc677ce4c744a5mitrepatch
- www.vulncheck.com/advisories/nbviewer-through-1.0.1-path-traversal-via-localfilehandlermitrethird-party-advisory
- github.com/jupyter/nbviewer/blob/1.0.1/nbviewer/providers/local/handlers.pymitretechnical-description
- github.com/jupyter/nbviewer/issues/1115mitreissue-tracking
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