Medium severity5.9NVD Advisory· Published Sep 6, 2026· Updated Sep 10, 2026

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Jupyter/nbviewerllm-fuzzy
Range: <=1.0.1

Patches

Vulnerability mechanics

References

github.com/jupyter/nbviewer/blob/1.0.1/nbviewer/providers/local/handlers.pynvd
github.com/jupyter/nbviewer/commit/aad36106f72a1ca7721310c6fccc677ce4c744a5nvd
github.com/jupyter/nbviewer/issues/1115nvd
www.vulncheck.com/advisories/nbviewer-through-1.0.1-path-traversal-via-localfilehandlernvd

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cvss	0.384
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000