CVE-2026-73415: Jupyterlab

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.10 and 4.6.2, in packages/imageviewer/src/widget.ts, JupyterLab's ImageViewer uses URL.createObjectURL for a specially crafted SVG image and revokes the blob URL too early, allowing the image to retain an executable same-origin context when it is opened through the image viewer and then opened in a new browser tab. The resulting cross-site scripting can be used to execute arbitrary code on the JupyterLab server. This issue is fixed in versions 4.5.10 and 4.6.2.

Affected products

• Jupyterlab Jupyterlab: before 4.5.10 (fixed in 4.5.10); from 4.6.0, before 4.6.2 (fixed in 4.6.2)

Published 2026-08-12. Last modified 2026-09-09.