CVE-2026-54528: CWE-178: Improper Handling of Case Sensitivity in jupyterlab jupyterlab-git
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.
AI Analysis
Technical Summary
CVE-2026-54528 describes an improper handling of case sensitivity (CWE-178) in the jupyterlab-git extension for JupyterLab. Before version 0.54.0, the extension uses fnmatch.fnmatchcase() in GitHandler.prepare() to enforce excluded_paths. On case-insensitive filesystems, an authenticated user can manipulate URL path casing to access directories that should be excluded, effectively bypassing access controls. The vulnerability has a CVSS 3.1 base score of 7.1, indicating high severity, with network attack vector, low attack complexity, requiring low privileges and no user interaction, impacting confidentiality with limited integrity impact and no availability impact. The issue is resolved in version 0.54.0.
Potential Impact
An authenticated user on a case-insensitive filesystem can bypass path exclusion controls by varying URL path casing, allowing unauthorized reading of directories that should be excluded. This leads to a confidentiality breach. There is no indication of impact on integrity or availability.
Mitigation Recommendations
Upgrade jupyterlab-git to version 0.54.0 or later, where this issue is fixed. Patch status is confirmed by the vendor stating the fix in 0.54.0. No other mitigation is indicated.
CVE-2026-54528: CWE-178: Improper Handling of Case Sensitivity in jupyterlab jupyterlab-git
Description
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.
CVSS v3.1
Score 7.1high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-54528 describes an improper handling of case sensitivity (CWE-178) in the jupyterlab-git extension for JupyterLab. Before version 0.54.0, the extension uses fnmatch.fnmatchcase() in GitHandler.prepare() to enforce excluded_paths. On case-insensitive filesystems, an authenticated user can manipulate URL path casing to access directories that should be excluded, effectively bypassing access controls. The vulnerability has a CVSS 3.1 base score of 7.1, indicating high severity, with network attack vector, low attack complexity, requiring low privileges and no user interaction, impacting confidentiality with limited integrity impact and no availability impact. The issue is resolved in version 0.54.0.
Potential Impact
An authenticated user on a case-insensitive filesystem can bypass path exclusion controls by varying URL path casing, allowing unauthorized reading of directories that should be excluded. This leads to a confidentiality breach. There is no indication of impact on integrity or availability.
Mitigation Recommendations
Upgrade jupyterlab-git to version 0.54.0 or later, where this issue is fixed. Patch status is confirmed by the vendor stating the fix in 0.54.0. No other mitigation is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-15T18:40:01.651Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4ebdf5c9d9e3dbe3bf8b05
Added to database: 07/08/2026, 21:15:33 UTC
Last enriched: 07/16/2026, 10:19:17 UTC
Last updated: 08/22/2026, 10:52:10 UTC
Views: 46
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