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CVE

CWE

Training

CVE-2026-42266

Published: May 13, 2026

Modified: May 21, 2026

PUBLISHED

CVSS v3.1

8.8

HIGH

Description

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.

Vendor	Product	Versions
jupyterlab	jupyterlab	affected `>= 4.0.0, < 4.5.7`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

References

https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4

x_refsource_CONFIRM

https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.7

x_refsource_MISC

https://jupyterhub.readthedocs.io/en/5.2.1/explanation/websecurity.html

x_refsource_MISC

https://jupyterlab.readthedocs.io/en/latest/user/extensions.html#extension-manager-implementations

x_refsource_MISC

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