How severe is CVE-2026-54528?

CVE-2026-54528 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-54528 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-54528?

CVE-2026-54528 affects Jupyter Jupyterlab-git. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-54528?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-54528 published?

CVE-2026-54528 was published on 2026-07-08 and last updated on 2026-07-15.

CVE-2026-54528

CVE-2026-54528 is a high-severity vulnerability in Jupyter Jupyterlab-git with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-178.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-178
Affected product: Jupyter Jupyterlab-git
Published: 2026-07-08
Last modified: 2026-07-15

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.

Frequently asked questions

What is CVE-2026-54528?: 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.
How severe is CVE-2026-54528?: CVE-2026-54528 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-54528 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-54528?: CVE-2026-54528 affects Jupyter Jupyterlab-git. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-54528?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-54528 published?: CVE-2026-54528 was published on 2026-07-08 and last updated on 2026-07-15.

References

Affected products (1)

cpe:2.3:a:jupyter:jupyterlab-git:*:*:*:*:*:*:*:*

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