Arbitrary Argument Injection Affecting jupyterlab package, versions <4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-JUPYTERLAB-16750460
- published18 May 2026
- disclosed13 May 2026
Introduced: 13 May 2026
CVE-2026-42266 (opens in a new tab)How to fix?
Upgrade Debian:unstable jupyterlab to version 4.4.10+ds1+3.1.0+0.16.6+~cs1.4.4-3 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream jupyterlab package and not the jupyterlab package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-42266
- 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
- https://access.redhat.com/security/cve/CVE-2026-42266
- https://bugzilla.redhat.com/show_bug.cgi?id=2477072
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42266.json