CVE-2026-42266

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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.7	Patch Release Notes
https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4	Mitigation Vendor Advisory
https://jupyterhub.readthedocs.io/en/5.2.1/explanation/websecurity.html	Product
https://jupyterlab.readthedocs.io/en/latest/user/extensions.html#extension-manager-implementations	Product
https://access.redhat.com/errata/RHSA-2026:43038
https://access.redhat.com/errata/RHSA-2026:60520
https://access.redhat.com/security/cve/CVE-2026-42266
https://bugzilla.redhat.com/show_bug.cgi?id=2477072
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42266.json

Configurations

Configuration 1 (hide)

cpe:2.3:a:jupyter:jupyterlab:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-13 16:16

Updated : 2026-08-28 16:17

NVD link : CVE-2026-42266

Mitre link : CVE-2026-42266

CVE.ORG link : CVE-2026-42266

JSON object : View

Products Affected

jupyter

jupyterlab

CWE

CWE-88

Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

CWE-602

Client-Side Enforcement of Server-Side Security

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