CVE detail
CVE-2026-42266
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.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 22.0 · diversity 19.5 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 0
- within the 30d window
- Peak daily
- 0
- highest bucket
Evidence
Source links by recency
8 source links · newest first
- https://access.redhat.com/errata/RHSA-2026:43038access.redhat.com
No excerpt available.
Exploitaccess.redhat.comMay 13, 2026, 4:16 PM - https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42266.jsonsecurity.access.redhat.com
No excerpt available.
Vendor Advisorysecurity.access.redhat.comMay 13, 2026, 4:16 PM - https://bugzilla.redhat.com/show_bug.cgi?id=2477072bugzilla.redhat.com
No excerpt available.
Exploitbugzilla.redhat.comMay 13, 2026, 4:16 PM - https://access.redhat.com/security/cve/CVE-2026-42266access.redhat.com
No excerpt available.
Exploitaccess.redhat.comMay 13, 2026, 4:16 PM - https://jupyterlab.readthedocs.io/en/latest/user/extensions.html#extension-manager-implementationsjupyterlab.readthedocs.io
No excerpt available.
Productjupyterlab.readthedocs.ioMay 13, 2026, 4:16 PM - https://jupyterhub.readthedocs.io/en/5.2.1/explanation/websecurity.htmljupyterhub.readthedocs.io
No excerpt available.
Productjupyterhub.readthedocs.ioMay 13, 2026, 4:16 PM No excerpt available.
Exploitgithub.comMay 13, 2026, 4:16 PMNo excerpt available.
Exploitgithub.comMay 13, 2026, 4:16 PM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
0 repository references · best confidence N/A · max 0 stars
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