CVE-2026-42266

HIGH EPSS 38.2%
Published May 13, 20261mo ago · Modified Jun 17, 20262w ago
8.8 CVSS 3.1
High
Find Similar
Published May 13, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
8.8
Exploitability
2.8
Impact
5.9
Vector string
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

Threat Intelligence

EPSS Exploit Probability
38.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-602
CWE-88

Affected Products 1

VendorProductVersionRange
jupyterjupyterlab*≥4.0.0  –  <4.5.7

References 4

  • github.com https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.7
    PatchRelease Notes
  • github.com https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4
    MitigationVendor Advisory
  • jupyterhub.readthedocs.io https://jupyterhub.readthedocs.io/en/5.2.1/explanation/websecurity.html
    Product
  • jupyterlab.readthedocs.io https://jupyterlab.readthedocs.io/en/latest/user/extensions.html#extension-manager-implementations
    Product

Remediation

  • github.com https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.7
    PatchRelease Notes