CVE-2026-54528Public exploitNetwork attack vector

Excluded-directory disclosure via case-sensitive path matching

Published Jul 8, 2026 · Updated Jul 8, 2026

Improper case handling in JupyterLab Git before 0.54.0 allows remote authenticated users to read excluded directories via HTTP requests. GitHandler.prepare() compares request paths with excluded_paths using case-sensitive fnmatchcase(), while downstream path resolution treats case variants as the same location. Exploitation requires configured exclusions on a case-insensitive filesystem such as macOS APFS or Windows NTFS and exposes file content, Git history, status, and diffs.

CVSS severity7.1
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper case handling in JupyterLab Git before 0.54.0 allows remote authenticated users to read excluded directories via HTTP requests. GitHandler.prepare() compares request paths with excluded_paths using case-sensitive fnmatchcase(), while downstream path resolution treats case variants as the same location. Exploitation requires configured exclusions on a case-insensitive filesystem such as macOS APFS or Windows NTFS and exposes file content, Git history, status, and diffs.

The record

CVE
CVE-2026-54528
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
Project Jupyter
Product
JupyterLab Git
Classifications
CWE-178, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.54.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Project Jupyter · JupyterLab Gitversion=< 0.54.0

Published CVSS scores

7.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-178Improper Handling of Case Sensitivity
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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