CVE-2026-73417
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk43th percentile - higher than 43% of all known CVEs
Summary
JupyterLab from version 3.3.0 to 4.5.10 and 4.6.2 has a vulnerability in notebook settings where sideBySideLeftMarginOverride and sideBySideRightMarginOverride are not properly validated before being inserted into style content. A crafted settings file can contain instructions that execute as code, and importing it or automatic application by an attacker can lead to code execution with the user's access.
Risk Assessment
Risk of malicious code execution in the user's context, potentially leading to reading or modifying notebooks and files and running code on a connected kernel.
Recommendation
Update JupyterLab to versions 4.5.10 or 4.6.2, which include the fix.
Original NVD description (English source)
jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 3.3.0 until 4.5.10 and 4.6.2, JupyterLab allows notebook settings to be shared and applied through an overrides.json file using the Import button in the Settings Editor. In packages/notebook-extension/schema/tracker.json and packages/notebook-extension/src/index.ts, the sideBySideLeftMarginOverride and sideBySideRightMarginOverride settings are not properly validated before being inserted into style content, allowing a crafted settings file to contain instructions that execute as code instead of only changing display preferences. A user can import the malicious file, or an attacker with access to a shared settings location can plant an overrides.json that is applied automatically. The embedded code runs with the affected user's access and can read or modify notebooks and files and run code through the notebook server, including on a connected kernel. This issue is fixed in versions 4.5.10 and 4.6.2.