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THREAT OPS › Threat News › [NVD] CVE-2026-42266 (HIGH 8.8) — 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

[NVD] CVE-2026-42266 (HIGH 8.8) — 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

lownvdPublished 2026-05-13

CVE-2026-42266 CVSS: 8.8 HIGH Published: 2026-05-13T16:16:47.017

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 cont

Indicators of compromise

CVE-2026-42266cve

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-42266