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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.

Quick assessment

Affected
jupyterlab jupyterlab
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

JupyterLab是JupyterLab开源的一个用于交互式和可重复计算的可扩展环境，基于 Jupyter Notebook 和架构。 jupyterlab 4.0.0版本至4.5.6版本存在参数注入漏洞，该漏洞源于PyPI Extension Manager的允许列表未正确执行，导致扩展安装不受限于默认PyPI索引。

CVSS 8.8 · High EPSS 0.85% · P57

Possible ATT&CK Techniques 1 AI

T1195.002 · Compromise Software Supply Chain

Affected Version Matrix 1

VendorProduct Version RangeStatus
jupyterlab jupyterlab >= 4.0.0, < 4.5.7 affected
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I. Basic Information for CVE-2026-42266

Vulnerability Information
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Vulnerability Title
JupyterLab has an Extension Manager API/GUI Policy Discrepancy allowing 3rd party (malicious) extensions install via POST request.
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
参数注入或修改
Source: CVE Program / CVE List V5
Vulnerability Title
JupyterLab 参数注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JupyterLab是JupyterLab开源的一个用于交互式和可重复计算的可扩展环境，基于 Jupyter Notebook 和架构。 jupyterlab 4.0.0版本至4.5.6版本存在参数注入漏洞，该漏洞源于PyPI Extension Manager的允许列表未正确执行，导致扩展安装不受限于默认PyPI索引。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jupyterlab jupyterlab >= 4.0.0, < 4.5.7 -

II. Public POCs for CVE-2026-42266

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III. Intelligence Information for CVE-2026-42266

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Vendor Advisories for CVE-2026-42266 (1)

Vendor Pages for CVE-2026-42266 (2)

IV. Related Vulnerabilities

Same product: jupyterlab
Same vendor: jupyterlab
Same weakness: CWE-88

V. Comments for CVE-2026-42266

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