CVE catalog

CVE-2020-26275

jupyter-server affected and fixed versions

[CVE catalog]

The Jupyter Server provides the backend (i.e. the core services, APIs, and REST endpoints) for Jupyter web applications like Jupyter notebook, JupyterLab, and Voila. In Jupyter Server before version 1.1.1, an open redirect vulnerability could cause the jupyter server to redirect the browser to a different malicious website. All jupyter servers running without a base_url prefix are technically affected, however, these maliciously crafted links can only be reasonably made for known jupyter server hosts. A link to your jupyter server may *appear* safe, but ultimately redirect to a spoofed server on the public internet. This same vulnerability was patched in upstream notebook v5.7.8. This is fixed in jupyter_server 1.1.1. If upgrade is not available, a workaround can be to run your server on a url prefix: "jupyter server --ServerApp.base_url=/jupyter/".

Severity
Medium
Published
Source
[NVD] · [CVE record]
EPSS
1.37% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / releasePackageVersionStatusSource
Debiantrixiejupyter-server1.1.1-1FixedDistribution-reported fixed boundary[CVE-2020-26275]
Debiantrixiejupyter-server2.15.0-1Fixed[CVE-2020-26275]
Debiansidjupyter-server1.1.1-1FixedDistribution-reported fixed boundary[CVE-2020-26275]
Debiansidjupyter-server2.20.0-3Fixed[CVE-2020-26275]
Debianforkyjupyter-server1.1.1-1FixedDistribution-reported fixed boundary[CVE-2020-26275]
Debianforkyjupyter-server2.20.0-3Fixed[CVE-2020-26275]
Debianbookwormjupyter-server1.1.1-1FixedDistribution-reported fixed boundary[CVE-2020-26275]
Debianbookwormjupyter-server1.23.3-1Fixed[CVE-2020-26275]

Showing 8 fix observations. All 10 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence
Distribution / releasePackageVersionStatusSource
Debianbookwormjupyter-server1.1.1-1FixedDistribution-reported fixed boundary[CVE-2020-26275]
Debianbookwormjupyter-server1.23.3-1Fixed[CVE-2020-26275]
Debianforkyjupyter-server1.1.1-1FixedDistribution-reported fixed boundary[CVE-2020-26275]
Debianforkyjupyter-server2.20.0-3Fixed[CVE-2020-26275]
Debiansidjupyter-server1.1.1-1FixedDistribution-reported fixed boundary[CVE-2020-26275]
Debiansidjupyter-server2.20.0-3Fixed[CVE-2020-26275]
Debiantrixiejupyter-server1.1.1-1FixedDistribution-reported fixed boundary[CVE-2020-26275]
Debiantrixiejupyter-server2.15.0-1Fixed[CVE-2020-26275]
Ubuntu22.04jupyter-server1.13.1-1Affected[UBUNTU-CVE-2020-26275]
Ubuntu22.04jupyter-server1.2.2-1Affected[UBUNTU-CVE-2020-26275]
Original provider fields
{
  "package_releases": [
    {
      "name": "jupyter-server",
      "status": "fixed",
      "release": "sid",
      "version": "2.20.0-3"
    },
    {
      "name": "jupyter-server",
      "status": "fixed",
      "release": "forky",
      "version": "2.20.0-3"
    },
    {
      "name": "jupyter-server",
      "status": "fixed",
      "release": "trixie",
      "version": "2.15.0-1"
    },
    {
      "name": "jupyter-server",
      "status": "fixed",
      "release": "bookworm",
      "version": "1.23.3-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "jupyter-server",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "1.1.1-1"
    },
    {
      "bug": null,
      "name": "jupyter-server",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "1.1.1-1"
    },
    {
      "bug": null,
      "name": "jupyter-server",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "1.1.1-1"
    },
    {
      "bug": null,
      "name": "jupyter-server",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "1.1.1-1"
    }
  ],
  "distribution_packages": [
    {
      "name": "jupyter-server",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "1.2.2-1",
        "1.13.1-1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-26275",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-26275",
      "provider_updated_at": "2025-09-08T16:46:23Z"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [jupyter-server]Unknown
    Details (2)

    • 1.23.3-1 · all · bookworm

      Fixed · Fixed: 1.1.1-1

      dsa · jupyter-server · debian · bookworm; dsa · jupyter-server · debian · 12

    • 1.23.3-1 · all · bookworm

      Fixed · Fixed: 1.1.1-1

      dsa · jupyter-server · debian · bookworm; dsa · jupyter-server · debian · 12

  • [python3-jupyter-server]Unknown

    Source package: [jupyter-server]

    Details (2)

    • 1.23.3-1 · all · bookworm

      Fixed · Fixed: 1.1.1-1

      dsa · jupyter-server · debian · bookworm; dsa · jupyter-server · debian · 12

    • 1.23.3-1 · all · bookworm

      Fixed · Fixed: 1.1.1-1

      dsa · jupyter-server · debian · bookworm; dsa · jupyter-server · debian · 12

[Debian 13 (Trixie)]

  • [jupyter-server]Unknown
    Details (2)

    • 2.15.0-1 · all · trixie

      Fixed · Fixed: 1.1.1-1

      dsa · jupyter-server · debian · 13

    • 2.15.0-1 · all · trixie

      Fixed · Fixed: 1.1.1-1

      dsa · jupyter-server · debian · 13

  • [python3-jupyter-server]Unknown

    Source package: [jupyter-server]

    Details (2)

    • 2.15.0-1 · all · trixie

      Fixed · Fixed: 1.1.1-1

      dsa · jupyter-server · debian · 13

    • 2.15.0-1 · all · trixie

      Fixed · Fixed: 1.1.1-1

      dsa · jupyter-server · debian · 13

  • [python-jupyter-server-doc]Unknown

    Source package: [jupyter-server]

    Details (2)

    • 2.15.0-1 · all · trixie

      Fixed · Fixed: 1.1.1-1

      dsa · jupyter-server · debian · 13

    • 2.15.0-1 · all · trixie

      Fixed · Fixed: 1.1.1-1

      dsa · jupyter-server · debian · 13

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]