CVE-2026-54338
Medium · 5.3CVSS
5.3
EPSS
0.4%
Published
Aug 7, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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