Vulnerability in Jupyter Jupyterlab
CVE-2026-42266
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_ex…
EPSS: 0.000 (8.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Jupyter Jupyterlab
- Jupyterlab — versions >= 4.0.0, < 4.5.7
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC, Release Notes)
- security-advisories@github.com (Product, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-42266?
- CVE-2026-42266 is a high-severity vulnerability in Jupyter Jupyterlab, classified under Argument Injection. CVSS score: 8.8/10. Published 2026-05-13.
- How severe is CVE-2026-42266?
- High severity. CVSS v3 base score is 8.8 out of 10.