CVE-2026-86258 — nbviewer through 1.0.1 Path Traversal via LocalFileHandler
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…
Published: 2026-09-06 · CVSS: 8.2 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7