CVE-2026-42266: Extension Installation Vulnerability in JupyterLab
Plattform
python
Komponente
jupyterlab
Behoben in
4.5.7
CVE-2026-42266 affects JupyterLab versions 4.0.0 through 4.5.6. This vulnerability arises from an improper enforcement of the allowedextensionsuris list within the PyPI Extension Manager, allowing the installation of extensions from outside the default PyPI index. Successful exploitation could enable an attacker to execute arbitrary code within the JupyterLab environment, compromising the system’s integrity and confidentiality. The vulnerability has been resolved in version 4.5.7.
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Auswirkungen und Angriffsszenarien
The core impact of CVE-2026-42266 lies in the ability for an attacker to install malicious extensions into JupyterLab. Because JupyterLab is often used for data analysis, scientific computing, and machine learning, a compromised environment could lead to the theft of sensitive data, manipulation of research results, or even the deployment of malware. An attacker could leverage this to gain persistent access to the system, potentially moving laterally to other resources on the network. The lack of proper extension validation means any package available on a reachable PyPI mirror could be exploited, significantly expanding the attack surface.
Ausnutzungskontext
CVE-2026-42266 was published on 2026-05-13. Its severity is rated HIGH (8.8) according to CVSS. There is currently no indication of this vulnerability being actively exploited in the wild, nor is it listed on KEV or EPSS. Public proof-of-concept (POC) code is not yet available, but the vulnerability's nature suggests it is likely to be targeted once a POC is released.
Bedrohungsanalyse
Exploit-Status
CISA SSVC
CVSS-Vektor
Was bedeuten diese Metriken?
- Attack Vector
- Netzwerk — aus der Ferne über das Internet ausnutzbar. Kein physischer oder lokaler Zugriff erforderlich.
- Attack Complexity
- Niedrig — keine besonderen Bedingungen erforderlich. Zuverlässig ausnutzbar.
- Privileges Required
- Niedrig — jedes gültige Benutzerkonto ist ausreichend.
- User Interaction
- Keine — automatischer und lautloser Angriff. Das Opfer tut nichts.
- Scope
- Unverändert — Auswirkung auf das anfällige Komponente beschränkt.
- Confidentiality
- Hoch — vollständiger Vertraulichkeitsverlust. Angreifer kann alle Daten lesen.
- Integrity
- Hoch — Angreifer kann beliebige Daten schreiben, ändern oder löschen.
- Availability
- Hoch — vollständiger Absturz oder Ressourcenerschöpfung. Totaler Denial of Service.
Betroffene Software
Schwachstellen-Klassifikation (CWE)
Zeitleiste
- Reserviert
- Veröffentlicht
Mitigation und Workarounds
The primary mitigation for CVE-2026-42266 is to immediately upgrade JupyterLab to version 4.5.7 or later. If upgrading is not immediately feasible, consider temporarily disabling the PyPI Extension Manager entirely. As a short-term workaround, restrict network access to JupyterLab instances to only trusted PyPI mirrors. Monitor JupyterLab logs for any unusual extension installation activity. Implement a Web Application Firewall (WAF) with rules to block requests to install extensions from untrusted sources. After upgrading, verify the fix by attempting to install an extension from a non-approved PyPI mirror; the installation should be rejected.
So behebenwird übersetzt…
Actualice JupyterLab a la versión 4.5.7 o superior para mitigar esta vulnerabilidad. La actualización corrige la política de cumplimiento de la lista de control de acceso de las extensiones, evitando la instalación de extensiones maliciosas desde fuentes no autorizadas.
Häufig gestellte Fragen
What is CVE-2026-42266 — Extension Installation Vulnerability in JupyterLab?
CVE-2026-42266 is a HIGH severity vulnerability affecting JupyterLab versions 4.0.0 through 4.5.6. It allows attackers to install arbitrary extensions from outside the default PyPI index, potentially leading to code execution.
Am I affected by CVE-2026-42266 in JupyterLab?
You are affected if you are using JupyterLab versions 4.0.0 to 4.5.6. Check your version using jupyter lab --version and upgrade immediately if vulnerable.
How do I fix CVE-2026-42266 in JupyterLab?
Upgrade JupyterLab to version 4.5.7 or later. If immediate upgrade is not possible, temporarily disable the PyPI Extension Manager or restrict network access to trusted PyPI mirrors.
Is CVE-2026-42266 being actively exploited?
There is currently no public evidence of CVE-2026-42266 being actively exploited, but it is considered a high-risk vulnerability and may be targeted in the future.
Where can I find the official JupyterLab advisory for CVE-2026-42266?
Refer to the official JupyterLab security advisory for CVE-2026-42266 on the JupyterLab GitHub repository: [https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-xxxx-xxxx-xxxx](https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-xxxx-xxxx-xxxx) (replace with actual advisory URL).
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