Detections
Analytics
CVE-2026-42266
high
Description
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.
References
https://jupyterlab.readthedocs.io/en/latest/user/extensions.html#extension-manager-implementations
https://jupyterhub.readthedocs.io/en/5.2.1/explanation/websecurity.html
https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4
https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.7