PYSEC-2026-3670 JupyterLab: PyPI extension blocklist package-name canonicalization bypass

JupyterLab's PyPI extension manager enforces blockedextensionsuris by comparing the requested install name to blocklist entries with a custom string normalization that is weaker than PyPI package-name canonicalization. An authenticated user can request a PyPI-equivalent spelling such as...

CVE-2026-73416 jupyterlab: PyPI extension blocklist package-name canonicalization bypass

jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.5.0 until 4.5.10 and 4.6.2, in jupyterlab/extensions/manager.py and jupyterlab/extensions/pypi.py, JupyterLab's PyPI extension manager enforces...

PT-2026-71917

Name of the Vulnerable Software and Affected Versions jupyterlab versions 4.5.0 through 4.5.9 jupyterlab versions 4.6.0 through 4.6.1 Description The PyPI extension manager in JupyterLab fails to properly enforce blocked extensions uris because it uses a custom normalization process that is weake...