PYSEC-2026-164

Vulnerability from pysec - Published: 2026-05-13 16:16 - Updated: 2026-05-27 12:25
VLAI
Details

JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.0.0 to 4.5.6, the allow-list of extensions that can be installed from PyPI Extension Manager (allowed_extensions_uris) is not correctly enforced by JupyterLab. The PyPI Extension Manager was not contained to packages listed on the default PyPI index. This vulnerability is fixed in 4.5.7.

Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Impacted products
Name purl
jupyterlab pkg:pypi/jupyterlab
Aliases
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "jupyterlab",
        "purl": "pkg:pypi/jupyterlab"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.5.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.0.0",
        "4.0.1",
        "4.0.10",
        "4.0.11",
        "4.0.12",
        "4.0.13",
        "4.0.2",
        "4.0.3",
        "4.0.4",
        "4.0.5",
        "4.0.6",
        "4.0.7",
        "4.0.8",
        "4.0.9",
        "4.1.0",
        "4.1.0a1",
        "4.1.0a2",
        "4.1.0a3",
        "4.1.0a4",
        "4.1.0b0",
        "4.1.0b1",
        "4.1.0b2",
        "4.1.0rc0",
        "4.1.0rc1",
        "4.1.1",
        "4.1.2",
        "4.1.3",
        "4.1.4",
        "4.1.5",
        "4.1.6",
        "4.1.7",
        "4.1.8",
        "4.2.0",
        "4.2.0a0",
        "4.2.0a1",
        "4.2.0a2",
        "4.2.0b0",
        "4.2.0b1",
        "4.2.0b2",
        "4.2.0b3",
        "4.2.0rc0",
        "4.2.1",
        "4.2.2",
        "4.2.3",
        "4.2.4",
        "4.2.5",
        "4.2.6",
        "4.2.7",
        "4.3.0",
        "4.3.0a0",
        "4.3.0a1",
        "4.3.0a2",
        "4.3.0b0",
        "4.3.0b1",
        "4.3.0b2",
        "4.3.0b3",
        "4.3.0rc0",
        "4.3.0rc1",
        "4.3.1",
        "4.3.2",
        "4.3.3",
        "4.3.4",
        "4.3.5",
        "4.3.6",
        "4.3.7",
        "4.3.8",
        "4.4.0",
        "4.4.0a0",
        "4.4.0a1",
        "4.4.0a2",
        "4.4.0a3",
        "4.4.0b0",
        "4.4.0b1",
        "4.4.0b2",
        "4.4.0rc0",
        "4.4.0rc1",
        "4.4.1",
        "4.4.10",
        "4.4.2",
        "4.4.3",
        "4.4.4",
        "4.4.5",
        "4.4.6",
        "4.4.7",
        "4.4.8",
        "4.4.9",
        "4.5.0",
        "4.5.0a0",
        "4.5.0a1",
        "4.5.0a2",
        "4.5.0a3",
        "4.5.0a4",
        "4.5.0b0",
        "4.5.0b1",
        "4.5.0rc0",
        "4.5.0rc1",
        "4.5.1",
        "4.5.2",
        "4.5.3",
        "4.5.4",
        "4.5.5",
        "4.5.6"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42266",
    "GHSA-37w4-hwhx-4rc4"
  ],
  "details": "JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.0.0 to 4.5.6, the allow-list of extensions that can be installed from PyPI Extension Manager (allowed_extensions_uris) is not correctly enforced by JupyterLab. The PyPI Extension Manager was not contained to packages listed on the default PyPI index. This vulnerability is fixed in 4.5.7.",
  "id": "PYSEC-2026-164",
  "modified": "2026-05-27T12:25:21.676195Z",
  "published": "2026-05-13T16:16:47.017Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://jupyterhub.readthedocs.io/en/5.2.1/explanation/websecurity.html"
    },
    {
      "type": "WEB",
      "url": "https://jupyterlab.readthedocs.io/en/latest/user/extensions.html#extension-manager-implementations"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4"
    },
    {
      "type": "FIX",
      "url": "https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.7"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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