{"cve":"CVE-2026-42266","nvd":{"published":"2026-05-13T16:16:47.017","modified":"2026-08-28T16:17:58.970","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-88","CWE-602"],"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"],"products":["jupyter:jupyterlab"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-42266","score":0.05652,"percentile":0.92967,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-37w4-hwhx-4rc4","url":"https://osv.dev/vulnerability/GHSA-37w4-hwhx-4rc4","summary":"JupyterLab has an Extension Manager API/GUI Policy Discrepancy, allowing 3rd party (malicious) extensions install via POST request","modified":"2026-09-10T03:51:04.397852198Z","packages":[{"ecosystem":"PyPI","name":"jupyterlab","purl":"pkg:pypi/jupyterlab","ranges":[">=4.0.0 <4.5.7"],"fixed":["4.5.7"]}]},{"id":"PYSEC-2026-164","url":"https://osv.dev/vulnerability/PYSEC-2026-164","summary":"","modified":"2026-05-27T13:56:09.132550385Z","packages":[{"ecosystem":"PyPI","name":"jupyterlab","purl":"pkg:pypi/jupyterlab","ranges":[">=4.0.0 <4.5.7"],"fixed":["4.5.7"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}