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CVE Vulnerability Details :
CVE-2026-42266
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-13 May, 2026 | 15:08
Updated At-14 May, 2026 | 03:56
Rejected At-
▼CVE Numbering Authority (CNA)
jupyterlab: Extension Manager API/GUI Policy Discrepancy allowing 3rd party (malicious) extensions install via POST request.

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.

Affected Products
Vendor
jupyterlab
Product
jupyterlab
Versions
Affected
  • >= 4.0.0, < 4.5.7
Problem Types
TypeCWE IDDescription
CWECWE-88CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
CWECWE-602CWE-602: Client-Side Enforcement of Server-Side Security
Type: CWE
CWE ID: CWE-88
Description: CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
Type: CWE
CWE ID: CWE-602
Description: CWE-602: Client-Side Enforcement of Server-Side Security
Metrics
VersionBase scoreBase severityVector
3.18.8HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Version: 3.1
Base score: 8.8
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4
x_refsource_CONFIRM
Hyperlink: https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4
Resource:
x_refsource_CONFIRM
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found