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CVE PROGRAM SOURCE RECORD8.6 High

CVE-2026-42557

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

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

jupyterlab jupyterlab

  • < 4.5.7affected

jupyter notebook

  • >= 7.0.0, < 7.5.6affected

References