CVE-2026-54528 PUBLISHED

jupyterlab-git excluded_paths Case-Sensitivity Bypass Allows Reading Excluded Directories

Assigner: GitHub_M
Reserved: 15.06.2026 Published: 08.07.2026 Updated: 09.07.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
CVSS Score: 7.1

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	jupyterlab
Product	jupyterlab-git
Versions	Version < 0.54.0 is affected

References

https://github.com/jupyterlab/jupyterlab-git/security/advisories/GHSA-436q-jwfr-rm2h
https://github.com/jupyterlab/jupyterlab-git/commit/460035275b5963dc96e364e60ba6a73717fbd033
https://github.com/jupyterlab/jupyterlab-git/releases/tag/v0.54.0

Problem Types

CWE-178: Improper Handling of Case Sensitivity CWE