Review reviewHigh

CVE-2026-42266

jupyterlab jupyterlab, Red Hat Migration Toolkit for Applications 8.2, Red Hat OpenShift AI (RHOAI)

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: 8.8
EPSS: 0.55%
CISA KEV: Not listed
Published: 2026.05.14

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.55%

Technical severityCVSS 8.8

Vulnerability overview

Affected product and versions

Product: jupyterlab jupyterlab, Red Hat Migration Toolkit for Applications 8.2, Red Hat OpenShift AI (RHOAI)
Affected versions: >= >= 4.0.0, < 4.5.7, >= 4.0.0 < 4.5.7
Fixed versions: 4.5.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that jupyterlab jupyterlab, Red Hat Migration Toolkit for Applications 8.2, Red Hat OpenShift AI (RHOAI) and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-602, CWE-88