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
2026-10-28T02:31:02Z
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
0 Unknown introduced commit / All previous commits are affected
Fixed
aad36106f72a1ca7721310c6fccc677ce4c744a5
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "last_affected":  "1.0.1"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "range":  [
                {
                    "fixed":  "aad36106f72a1ca7721310c6fccc677ce4c744a5"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

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"