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CVE-2026-54528— jupyterlab-git excluded_paths Case-Sensitivity Bypass Allows Reading Excluded Directories

Quick assessment

Affected
jupyterlab jupyterlab-git
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

JupyterLab jupyterlab-git是JupyterLab基金会开源的一个 JupyterLab 的 Git 扩展。 jupyterlab-git 0.54.0之前版本存在输入验证错误漏洞，该漏洞源于在jupyterlab_git/handlers.py中使用fnmatch.fnmatchcase()来强制执行排除路径，可能导致经过身份验证的用户通过不区分大小写的文件系统更改URL路径大小写并读取排除目录。

CVSS 7.1 · High EPSS 0.41% · P35

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
jupyterlab jupyterlab-git < 0.54.0 affected
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I. Basic Information for CVE-2026-54528

Vulnerability Information
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Vulnerability Title
jupyterlab-git excluded_paths Case-Sensitivity Bypass Allows Reading Excluded Directories
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
jupyterlab-git 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JupyterLab jupyterlab-git是JupyterLab基金会开源的一个 JupyterLab 的 Git 扩展。 jupyterlab-git 0.54.0之前版本存在输入验证错误漏洞，该漏洞源于在jupyterlab_git/handlers.py中使用fnmatch.fnmatchcase()来强制执行排除路径，可能导致经过身份验证的用户通过不区分大小写的文件系统更改URL路径大小写并读取排除目录。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jupyterlab jupyterlab-git < 0.54.0 -

II. Public POCs for CVE-2026-54528

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6089 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-54528

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Patches & Fixes for CVE-2026-54528 (1)

Vendor Advisories for CVE-2026-54528 (1)

Vendor Pages for CVE-2026-54528 (1)

IV. Related Vulnerabilities

Same product: jupyterlab-git
Same vendor: jupyterlab
Same weakness: CWE-178

V. Comments for CVE-2026-54528

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