7.1

CVE-2026-54528: jupyter jupyterlab-git Improper Handling of Case Sensitivity

CVSS: 7.1v3.1HighAnalyzed
AliasesGHSA-436q-jwfr-rm2hPYSEC-2026-2539
Published 08-07-2026Last modified 09-07-2026
Open JSON

Vulnerability summary

CVE-2026-54528 is a high (CVSS 7.1) Improper Handling of Case Sensitivity vulnerability in jupyter jupyterlab-git. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 33.9% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
38/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.41%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 08-07-2026
    PublishedVulnerability first disclosed.
  2. 09-07-2026
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

0.00 pp

From 0.41% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.41%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Jupyterlab Git

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Jupyter1 product
Jupyterlab1 product
PyPI1 product
  • jupyterlab-git< 0.54.0

3 vendors · 3 products

References

7 links