CVE Watch28 ago 2026

CVE-2026-42557

jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5

CVSS

9.6

Crítico

EPSS

0.4%

p31

KEV

—

Exploit Today

0-100

Publicado: 13 may 2026 · Última mod.: 28 ago 2026 · CWE-79

EPSS · 30d

0.3%EPSS · 30 días0.4%

2026-08-222026-09-19

Descripción técnica

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.

Referencias oficiales

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