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CVE-2026-42557PYSEC-2026-2681BIT-JUPYTER-BASE-NOTEBOOK-2026-42557BIT-JUPYTER-NOTEBOOK-2026-42557BIT-JUPYTERLAB-2026-42557GHSA-MQCG-5X36-VFCGPYSEC-2026-2537

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.5.7, 7.5.6
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • jupyterlab jupyterlab

    fixed in 4.5.7

  • jupyter notebook

    From 7.0.0 · fixed in 7.5.6

  • notebookPyPI

    From 7.0.0 · fixed in 7.5.6

  • jupyterlabPyPI

    fixed in 4.5.7

References 1

GitHub · jupyterlab/jupyterlab