{"action":"Upgrade jupyterlab to 4.5.7 or later.","affected":[{"fixed":"4.5.7","introduced":"4.0.0"}],"component":"jupyterlab","cve_ids":["CVE-2026-42266"],"ecosystem":"PyPI","epss":0.05652,"exploited":false,"fixed_versions":["4.5.7"],"ghsa_id":"GHSA-37w4-hwhx-4rc4","id":"tcs_01M5KGTT31B69VVCGZ38KSVVE3","modified_at":"2026-05-27T13:56:09.132550385Z","published_at":"2026-05-13T16:16:47.017Z","references":["https://osv.dev/vulnerability/PYSEC-2026-164","https://jupyterhub.readthedocs.io/en/5.2.1/explanation/websecurity.html","https://jupyterlab.readthedocs.io/en/latest/user/extensions.html#extension-manager-implementations","https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4","https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.7"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"PYSEC-2026-164","url":"https://osv.dev/vulnerability/PYSEC-2026-164"}],"summary":"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"}