{"id":"CVE-2026-42266","title":"JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture","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 from PyPI Extension Manager (allowed_…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-88","CWE-602"],"vendor":"jupyter","product":"jupyterlab","affected":["jupyterlab >= 4.0.0, < 4.5.7"],"patched":["jupyterlab 4.5.7"],"published":"2026-05-13","updated":"2026-07-06","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-42266","references":[{"url":"https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.7","label":"security-advisories@github.com"},{"url":"https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4","label":"security-advisories@github.com"},{"url":"https://jupyterhub.readthedocs.io/en/5.2.1/explanation/websecurity.html","label":"security-advisories@github.com"},{"url":"https://jupyterlab.readthedocs.io/en/latest/user/extensions.html#extension-manager-implementations","label":"security-advisories@github.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-42266","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477072","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42266.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42266"},{"url":"https://github.com/jupyterlab/jupyterlab"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/jupyterlab/PYSEC-2026-164.yaml"}],"tags":["nvd","osv","pip"],"epss":0.00629,"epssPercentile":0.48779,"ingestedAt":"2026-07-06T17:44:51.161Z","aliases":["GHSA-37w4-hwhx-4rc4","BIT-jupyterlab-2026-42266","PYSEC-2026-164"],"ecosystem":"pip","slug":"CVE-2026-42266","body":"## Overview\n\nJupyterLab 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.\n\n## Affected\n\n- `jupyterlab >= 4.0.0, < 4.5.7`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `jupyterlab 4.5.7`\n\n## Package advisory (CVE-2026-42266)\n\nAffected packages:\n\n- `jupyterlab >= 4.0.0, < 4.5.7`\n\nPatched in:\n\n- `jupyterlab 4.5.7`\n\nSource: https://osv.dev/vulnerability/GHSA-37w4-hwhx-4rc4","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}