CVE-2026-42266HIGH 8.8EPSS p38.0%
CVE-2026-42266CVE-2026-42266
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.
Scoring
| CVSS 3.1 | 8.8 (HIGH) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 0.49% probability of exploitation · percentile 38.0% · 2026-06-18T12:00:27Z |
| Published | 2026-05-13 |
| Last modified | 2026-05-26 |
Underlying weaknesses· 2
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
2
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Client-Side Enforcement of Server-Side Securitycwe-602 | 0% | live |
| Weakness | Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')cwe-88 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.