CVE•Published 2026-05-13•Modified 2026-05-26•1 article on news•6 live references•NVD data
CVE-2026-42266Jupyter · Jupyterlab
Vulnerability data via NVD (ingested)
CVSS v3.1
8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
—
Weaknesses (CWE)
Description
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.
Timeline
Published 2026-05-13
Modified 2026-05-26
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-42266Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Jupyter Jupyterlab"All exposed Jupyter Jupyterlab instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Jupyterlab"HTTP body or banner mentions "Jupyterlab" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-42266Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-42266Censys host search filtered to this CVE id.
grep.app
CVE-2026-42266Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-42266GitHub code search for direct mentions.
Google dork
"CVE-2026-42266" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-42266 on GitHub.