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CVE-2026-42266

JupyterLab has an Extension Manager API/GUI Policy Discrepancy allowing 3rd party (malicious) extensions install via POST request. PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
jupyterlab / jupyterlabaffected >= 4.0.0, < 4.5.7

CWE

CWE-88, CWE-602

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

A flaw was found in JupyterLab, an extensible environment for interactive computing. The PyPI Extension Manager, responsible for installing extensions, failed to properly enforce its allow-list of approved extensions. This vulnerability allowed for the installation of unauthorized extensions from sources outside the default PyPI index. Exploitation of this flaw could lead to arbitrary code execution and significant system compromise.