{"id":"CVE-2026-86258","aliases":["EUVD-2026-72125","GHSA-v7gx-3h93-r9v6"],"status":"published","title":"nbviewer through 1.0.1 Path Traversal via LocalFileHandler","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.","severity":{"version":"4.0","score":8.2,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00522,"percentile":0.44585,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-22"],"published":"2026-09-06T12:37:49Z","modified":"2026-10-28T02:31:02Z","products":[{"vendor":"jupyter","product":"nbviewer"}],"references":[{"url":"https://github.com/jupyter/nbviewer/issues/1115","tags":["issue-tracking","report"]},{"url":"https://github.com/jupyter/nbviewer/blob/1.0.1/nbviewer/providers/local/handlers.py#L92-L107","tags":["technical-description","article"]},{"url":"https://github.com/jupyter/nbviewer/commit/aad36106f72a1ca7721310c6fccc677ce4c744a5","tags":["patch","fix"]},{"url":"https://github.com/jupyter/nbviewer","tags":["product","package"]},{"url":"https://www.vulncheck.com/advisories/nbviewer-through-1.0.1-path-traversal-via-localfilehandler","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86258","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-v7gx-3h93-r9v6"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86258.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-86258","title":"nbviewer through 1.0.1 Path Traversal via LocalFileHandler","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.","status":"published","published":"2026-09-06T12:37:49.496Z","modified":"2026-09-24T14:21:19.1Z","cvss":[{"version":"4.0","score":8.2,"vector":"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","level":"high","assessor":"cna"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T13:49:31.546614Z"}],"euvd":[{"id":"EUVD-2026-72125","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.","status":"published","published":"2026-09-06T12:37:49Z","modified":"2026-09-24T14:21:19Z","cvss":[{"version":"4.0","score":8.2,"vector":"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","level":"high"}],"updated_at":"2026-11-02T17:27:57.402158Z"}],"ghsa":[{"id":"GHSA-v7gx-3h93-r9v6","title":"nbviewer through 1.0.1 contains a path traversal vulnerability in LocalFileHandler.can_show()...","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.","status":"published","published":"2026-09-06T15:31:05Z","modified":"2026-09-06T15:31:06Z","cvss":[{"version":"4.0","score":8.2,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:11:25.773648Z"}],"nvd":[{"id":"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. 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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.","status":"published","published":"2026-09-06T12:37:49.496Z","modified":"2026-10-28T02:31:02.276183847Z","cvss":[{"version":"4.0","score":8.2,"vector":"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","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:45:18.825071Z"}]}}