CVE-2026-42266

JupyterLab has an Extension Manager API/GUI Policy Discrepancy allowing 3rd party (malicious) extensions install via POST request.

CVSS 8.8 HIGHEPSS 0.5%CWE-602 CWE-88

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Productos afectados

jupyterlab · jupyterlab

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Referencias

https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.7 https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4 https://jupyterhub.readthedocs.io/en/5.2.1/explanation/websecurity.html https://jupyterlab.readthedocs.io/en/latest/user/extensions.html#extension-manager-implementations