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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-42266)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-42266)

ID	Name	Product	Family	Severity
315091	Linux Distros Unpatched Vulnerability : CVE-2026-42266	Nessus	Misc.	high
441215	SCA: security update for jupyterlab (GHSA-37w4-hwhx-4rc4)	Tenable Cloud Security	SCA Checks	high
441215	SCA: security update for jupyterlab (GHSA-37w4-hwhx-4rc4)	Tenable Self-Hosted Container Security	SCA Checks	high

Detections

Analytics

CVE-2026-42266

high

Tenable Plugins

high

high

high