{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-86258",
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "state": "PUBLISHED",
        "assignerShortName": "VulnCheck",
        "dateReserved": "2026-09-06T11:35:19.317Z",
        "datePublished": "2026-09-06T12:37:49.496Z",
        "dateUpdated": "2026-09-06T12:37:49.496Z"
    },
    "containers": {
        "cna": {
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                "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
                "shortName": "VulnCheck",
                "dateUpdated": "2026-09-06T12:37:49.496Z"
            },
            "datePublic": "2026-06-18T00:00:00.000Z",
            "title": "nbviewer through 1.0.1 Path Traversal via LocalFileHandler",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')",
                            "cweId": "CWE-22",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "jupyter",
                    "product": "nbviewer",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:pypi/nbviewer",
                    "versions": [
                        {
                            "version": "0",
                            "lessThanOrEqual": "1.0.1",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
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                    "cvssV4_0": {
                        "version": "4.0",
                        "vectorString": "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",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 8.2,
                        "baseSeverity": "HIGH"
                    }
                },
                {
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                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
                        "attackVector": "NETWORK",
                        "attackComplexity": "HIGH",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "NONE",
                        "baseScore": 5.9,
                        "baseSeverity": "MEDIUM"
                    }
                }
            ],
            "references": [
                {
                    "url": "https://github.com/jupyter/nbviewer/issues/1115",
                    "tags": [
                        "issue-tracking"
                    ],
                    "name": "GitHub Issue #1115"
                },
                {
                    "url": "https://github.com/jupyter/nbviewer/blob/1.0.1/nbviewer/providers/local/handlers.py#L92-L107",
                    "tags": [
                        "technical-description"
                    ],
                    "name": "LocalFileHandler.can_show() at 1.0.1"
                },
                {
                    "url": "https://github.com/jupyter/nbviewer/commit/aad36106f72a1ca7721310c6fccc677ce4c744a5",
                    "tags": [
                        "patch"
                    ],
                    "name": "Fix path-containment bypass in LocalFileHandler.can_show (PR #1116)"
                },
                {
                    "url": "https://github.com/jupyter/nbviewer",
                    "tags": [
                        "product"
                    ]
                },
                {
                    "name": "VulnCheck Advisory: nbviewer through 1.0.1 Path Traversal via LocalFileHandler",
                    "tags": [
                        "third-party-advisory"
                    ],
                    "url": "https://www.vulncheck.com/advisories/nbviewer-through-1.0.1-path-traversal-via-localfilehandler"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Yu Sun",
                    "type": "reporter"
                }
            ],
            "x_generator": {
                "engine": "vulncheck-endgame"
            }
        }
    }
}