CVE-2026-54528: Jupyter Jupyterlab-Git

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

JupyterLab Git is a Git extension for JupyterLab. Prior to 0.54.0, jupyterlab-git uses fnmatch.fnmatchcase() in GitHandler.prepare() in jupyterlab_git/handlers.py to enforce excluded_paths, allowing an authenticated user on a case-insensitive filesystem to vary URL path casing and read excluded directories. This issue is fixed in version 0.54.0.

Affected products

• Jupyter Jupyterlab-Git: before 0.54.0 (fixed in 0.54.0)

Published 2026-07-08. Last modified 2026-07-15.