CVE-2026-42557
Full vulnerability record from the local CVENow database.
Description
jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all click events on document.body and executes the named command without checking whether the element came from trusted JupyterLab UI. A notebook with a pre-saved HTML cell output containing a deceptive button can trigger arbitrary JupyterLab commands - including arbitrary code execution - on a single user click, without any code being submitted for execution by the user. This vulnerability is fixed in 4.5.7.
Severity
HIGH
CVSS score
8.6
(v4.0)
Vulnerability status
Modified
Source identifier
Published
2026-05-13 16:16:48.167000
Last modified
2026-10-25 23:10:00.167000
View original CVE JSON
{
"id": "CVE-2026-42557",
"sourceIdentifier": "[email protected]",
"published": "2026-05-13T16:16:48.167",
"lastModified": "2026-10-25T23:10:00.167",
"vulnStatus": "Modified",
"cveTags": [],
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{
"lang": "en",
"value": "jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all click events on document.body and executes the named command without checking whether the element came from trusted JupyterLab UI. A notebook with a pre-saved HTML cell output containing a deceptive button can trigger arbitrary JupyterLab commands - including arbitrary code execution - on a single user click, without any code being submitted for execution by the user. This vulnerability is fixed in 4.5.7."
},
{
"lang": "es",
"value": "jupyterlab es un entorno extensible para computación interactiva y reproducible, basado en la Arquitectura de Jupyter Notebook. Antes de la versión 4.5.7, el saneador HTML de JupyterLab permite data-commandlinker-command y data-commandlinker-args en elementos de botón, mientras que CommandLinker escucha todos los eventos de clic en document.body y ejecuta el comando nombrado sin verificar si el elemento provino de la interfaz de usuario (UI) confiable de JupyterLab. Un cuaderno con una salida de celda HTML preguardada que contiene un botón engañoso puede activar comandos arbitrarios de JupyterLab - incluyendo ejecución de código arbitrario - con un solo clic del usuario, sin que el usuario envíe ningún código para su ejecución. Esta vulnerabilidad está corregida en la versión 4.5.7."
}
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