jupyterlab: jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Arc...
CVE-2026-42557 is fixed in jupyterlab on 1 platform by DEBIAN-CVE-2026-42557 (version 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3), released May 13, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
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 click events on document.body and executes the named command without checking whether the element came from trusted JupyterLab UI. A notebook with a pre-saved HTML cell output containing a deceptive button can trigger arbitrary JupyterLab commands - including arbitrary code execution - on a single user click, without any code being submitted for execution by the user. This vulnerability is fixed in 4.5.7.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| jupyterlab · Debian 14 | 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3 | DEBIAN-CVE-2026-42557 | May 13, 2026 |
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