VulnerabilityAwaiting Analysis

CVE-2026-54338

JupyterHub is software that allows users to create a multi-user server for Jupyter notebooks.

MEDIUM 5.3EPSS 0.28%

Does this matter?

Lower severity and a low EPSS score (0.28%). Track it; it rarely justifies an emergency change on its own.

Description

JupyterHub is software that allows users to create a multi-user server for Jupyter notebooks. Prior to 5.5.0, invalid input to form-based login authenticators can place an unbounded attacker-controlled username in failed-login logs, allowing an unauthenticated attacker to consume logging and storage resources. This issue is fixed in version 5.5.0.

CVSS 3.1: 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS: 0.28% probability · 21th percentile
CISA KEV: Not listed
Weakness: CWE-400
Source: security-advisories@github.com

References

https://github.com/jupyterhub/jupyterhub/commit/d6dc595f84b7509969686da31d87d6d69e7fce0a
https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-p43p-whwx-q52h

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.