VULNRABLE / Vulnerability / CVE-2026-54338

CVE-2026-54338

MEDIUM LOW jupyterhub GHSA

Exploit verdict: No active-exploit signal

CVSS Score

5.5

Severity

MEDIUM

EPSS

Source

GHSA

Summary

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

What this means

CVE-2026-54338 is a medium-severity vulnerability affecting jupyterhub, rated CVSS 5.5. The EPSS model estimates a 0% probability of exploitation in the next 30 days. Published August 26, 2026.

View full advisory at GHSA →