{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:jupyter:jupyter_server:2.17.0:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "2.17.0"
              },
              {
                "last_affected": "2.17.0"
              }
            ],
            "source": "CPE_STRING"
          },
          "events": [
            {
              "introduced": "3b03c644b56cf100f4535f70e2e8f4a45a57a5b8"
            },
            {
              "last_affected": "3b03c644b56cf100f4535f70e2e8f4a45a57a5b8"
            }
          ],
          "repo": "https://github.com/jupyter-server/jupyter_server",
          "type": "GIT"
        }
      ],
      "versions": [
        "2.17.0"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "@huntr_ai",
    "cwe_ids": [
      "CWE-23"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5422.json"
  },
  "details": "A path traversal vulnerability exists in jupyter-server version 2.17.0 due to an incorrect root directory boundary check in the _get_os_path() function within jupyter_server/services/contents/fileio.py. The check uses startswith(root) without appending a trailing path separator, allowing sibling directories with names starting with the same prefix as root_dir to bypass the check. Additionally, the to_os_path() function in utils.py does not strip \"..\" from path parts, enabling traversal sequences to bypass the vulnerable check. This vulnerability can lead to unauthorized read/write access to files in sibling directories, potentially exposing sensitive data in shared hosting environments.",
  "id": "CVE-2026-5422",
  "modified": "2026-07-08T05:37:54.293283665Z",
  "published": "2026-06-02T09:11:15.755Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://huntr.com/bounties/24a36953-6490-466f-8cb2-a90d1ca56e0f"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5422.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5422"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Path Traversal in jupyter/jupyter"
}