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CVE-2026-42557

8.6 high SSVC exploitation: none Modified
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.6 · jupyterNVD modified 2026-10-25 23:10

Affected (CPE criteria) 2

  • cpe:2.3:a:jupyter:jupyterlab:*:*:*:*:*:*:*:*
  • cpe:2.3:a:jupyter:notebook:*:*:*:*:*:*:*:*

References 6