Vulnerability in Jupyter Jupyterlab-Git
CVE-2026-54528
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.
EPSS: 0.004 (28.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
Affected products
- Jupyter Jupyterlab-git
- Jupyterlab Jupyterlab-git — versions < 0.54.0
Weakness classification (CWE)
References
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-54528?
- CVE-2026-54528 is a high-severity vulnerability in Jupyter Jupyterlab-Git, classified under Improper Handling of Case Sensitivity. CVSS score: 7.1/10. Published 2026-07-08.
- How severe is CVE-2026-54528?
- High severity. CVSS v3 base score is 7.1 out of 10.