VULNERABILITY INTELLIGENCE
CVE-2026-54338
CVSS score5.3 MEDIUM
EPSS probability0.44%
CISA KEVNot currently listed
Published2026-08-07
Last modified2026-09-09
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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.
Weakness classification
- security-advisories@github.com: CWE-400