CVE-2026-86258

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Source

https://cve.org/CVERecord?id=CVE-2026-86258

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86258.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-86258

Published

2026-09-06T12:37:49Z

Modified

2026-09-11T03:30:52Z

Severity

8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

nbviewer through 1.0.1 Path Traversal via LocalFileHandler

Details

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.

Database specific

{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-22"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86258.json"
}

References

Affected packages

Git / github.com/jupyter/nbviewer

Affected ranges

Type

GIT

Repo

https://github.com/jupyter/nbviewer

Events

Introduced

Fixed

1d2f3707404b880b5bbf2bb31914be19820c68ba

Fixed

aad36106f72a1ca7721310c6fccc677ce4c744a5

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.0.1"
        }
    ],
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Affected versions

1.*

1.0.0

1.0.1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86258.json"