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DEBIAN-CVE-2026-35397

Type: advisorySource: OSV1 source record

Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, a path traversal vulnerability in the REST API allows an authenticated user to escape the configured root_dir and access sibling directories whose names begin with the same prefix as the root_dir. For example, with a root_dir named "test", the API permits access to a sibling directory named "testtest" through a crafted request to the /api/contents endpoint using encoded path components. An attacker can read, write, and delete files in affected sibling directories. Multi-tenant deployments using predictable naming schemes are particularly at risk, as a user with a directory named "user1" could access directories for user10 through user19 and beyond. A user who can choose a single-character folder name could gain access to a significant number of sibling directories. Version 2.18.0 contains a fix. As a workaround, ensure folder names do not share a common prefix with any sibling directory.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-35397

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-35397

jupyter-server

Source reference: /affected/0/package/name

Affected versions
1.23.3-1

Source reference: /affected/0/versions

1.23.3-2

Source reference: /affected/0/versions

2.14.0-1

Source reference: /affected/0/versions

2.14.2-1

Source reference: /affected/0/versions

2.14.2-2

Source reference: /affected/0/versions

2.14.2-3

Source reference: /affected/0/versions

2.14.2-4

Source reference: /affected/0/versions

2.14.2-5

Source reference: /affected/0/versions

2.15.0-1

Source reference: /affected/0/versions

2.17.0-1

Source reference: /affected/0/versions

2.20.0-1

Source reference: /affected/0/versions

2.20.0-2

Source reference: /affected/0/versions

2.20.0-3

Source reference: /affected/0/versions

2.9.1-1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

jupyter-server

Source reference: /affected/1/package/name

Affected versions
2.15.0-1

Source reference: /affected/1/versions

2.17.0-1

Source reference: /affected/1/versions

2.20.0-1

Source reference: /affected/1/versions

2.20.0-2

Source reference: /affected/1/versions

2.20.0-3

Source reference: /affected/1/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

jupyter-server

Source reference: /affected/2/package/name

Affected versions
2.15.0-1

Source reference: /affected/2/versions

2.17.0-1

Source reference: /affected/2/versions

Fixed versions
2.20.0-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "jupyter-server",
      "purl": "pkg:deb/debian/jupyter-server?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "1.23.3-1",
      "1.23.3-2",
      "2.14.0-1",
      "2.14.2-1",
      "2.14.2-2",
      "2.14.2-3",
      "2.14.2-4",
      "2.14.2-5",
      "2.15.0-1",
      "2.17.0-1",
      "2.20.0-1",
      "2.20.0-2",
      "2.20.0-3",
      "2.9.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-35397.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "jupyter-server",
      "purl": "pkg:deb/debian/jupyter-server?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2.15.0-1",
      "2.17.0-1",
      "2.20.0-1",
      "2.20.0-2",
      "2.20.0-3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-35397.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.20.0-1"
          }
        ]
      }
    ],
    "package": {
      "name": "jupyter-server",
      "purl": "pkg:deb/debian/jupyter-server?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2.15.0-1",
      "2.17.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-35397.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56856 · Revision 1
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Publisher date
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