CVSS 3.1
8.8 highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCVE-2026-42266
High (8.8) in jupyter jupyterlab. EPSS 5.7% chance of exploitation in the next 30 days. Fixed in jupyterlab 4.5.7.
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.
Severity
- EPSS
- 5.7% chance of exploitation in the next 30 days; higher than 92% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-88, CWE-602
- Published
- Modified
- Record from
- the NVD, synced
Affected
- jupyter:jupyterlab
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-37w4-hwhx-4rc4 | PyPI | jupyterlab | >=4.0.0 <4.5.7 | 4.5.7 |
| PYSEC-2026-164 | PyPI | jupyterlab | >=4.0.0 <4.5.7 | 4.5.7 |
References
- https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.7
- https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4
- https://jupyterhub.readthedocs.io/en/5.2.1/explanation/websecurity.html
- https://jupyterlab.readthedocs.io/en/latest/user/extensions.html#extension-manager-implementations
- https://access.redhat.com/errata/RHSA-2026:43038