Bug 2477072 (CVE-2026-42266) - CVE-2026-42266 jupyterlab: JupyterLab: Arbitrary code execution due to improper enforcement of extension allow-list
Summary: CVE-2026-42266 jupyterlab: JupyterLab: Arbitrary code execution due to improp...
Keywords:
Status: NEW
Alias: CVE-2026-42266
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2493344 2493346
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-13 16:02 UTC by OSIDB Bzimport
Modified: 2026-06-26 06:52 UTC (History)
3 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-05-13 16:02:36 UTC 
jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.0.0 to 4.5.6, the allow-list of extensions that can be installed from PyPI Extension Manager (allowed_extensions_uris) is not correctly enforced by JupyterLab. The PyPI Extension Manager was not contained to packages listed on the default PyPI index. This vulnerability is fixed in 4.5.7.
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