CVE-2026-86258: nbviewer through 1.0.1 Path Traversal via LocalFileHandler
jupyter · nbviewer
Vendor fix available · Affected: jupyter nbviewer · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 44% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- jupyter · nbviewerup to and including 1.0.1
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- jupyter
- Published
- September 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-86258 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.