PyPI/jupyterlab CVE-2026-42266: high 8.8, EPSS 0.85%
JupyterLab has an Extension Manager API/GUI Policy Discrepancy, allowing 3rd party (malicious) extensions install via POST request
Action: Upgrade jupyterlab to 4.5.7 or later.
pip install jupyterlab==4.5.7Affected
| introduced | fixed | last affected |
|---|---|---|
| 4.0.0 | 4.5.7 | - |
Fixed versions
| 4.5.7 |
Sources
- osv: GHSA-37w4-hwhx-4rc4
- https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4
- https://nvd.nist.gov/vuln/detail/CVE-2026-42266
- https://github.com/jupyterlab/jupyterlab
- https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.7
- https://github.com/pypa/advisory-database/tree/main/vulns/jupyterlab/PYSEC-2026-164.yaml
- https://jupyterhub.readthedocs.io/en/5.2.1/explanation/websecurity.html
- https://jupyterlab.readthedocs.io/en/latest/user/extensions.html#extension-manager-implementations
CVE-2026-42266 · published · modified · JSON