BIT-JUPYTERLAB-2026-42557 jupyterlab: Command linker attributes in HTML enable one-click command execution from untrusted content

jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all cli...

CVE-2026-42266

JupyterLab prior to 4.5.7 is affected: from 4.0.0 to 4.5.6 the allow-list for PyPI Extension Manager extensions could be bypassed, as allowed_extensions_uris was not properly enforced and not confined to the default PyPI index. This could allow an authenticated attacker to install unapproved/mali...