VULNERABILITY INTELLIGENCE
CVE-2026-86258
CVSS score5.9 MEDIUM
EPSS probability0.52%
CISA KEVNot currently listed
Published2026-09-06
Last modified2026-09-10
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
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.
Weakness classification
- disclosure@vulncheck.com: CWE-22