Is jupyterlab affected by CVE-2026-42266?

PyPI jupyterlab is affected in >=4.0.0 <4.5.7.

Is CVE-2026-42266 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

high

CVE-2026-42266

Q: Is CVE-2026-42266 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

PyPI · jupyterlab

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_extensions_uris) is not correctly enforced by JupyterLab. The P

Severity: high
EPSS: 0.5% (p38)
Also known as: GHSA-37w4-hwhx-4rc4, BIT-jupyterlab-2026-42266, PYSEC-2026-164
Published: 2026-05-13

References

Related advisories

CVE-2026-42557 — high · PyPI/jupyterlab
CVE-2026-40171 — high · PyPI/jupyterlab
GHSA-vmhf-c436-hxj4 — medium · PyPI/jupyterlab

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.