Vulnerabilities CVE-2026-54338

CVE-2026-54338

Medium

Open

TLP:CLEAR

JupyterHub: Unauthenticated Denial of Service via Unbounded Username Logging on Failed Login

NVD CVE.org

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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.

Details

CVSS Score: 5.3
EPSS Score ⓘ: 0.28%

20.4th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Confidence: 90%
Published: Aug 7, 2026
Last Modified: Aug 11, 2026

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