CVE-2026-54338 JupyterHub: Unauthenticated Denial of Service via Unbounded Username Logging on Failed Login
| Reporter | Title | Published | Views | Family All 4 |
|---|---|---|---|---|
 | CVE-2026-54338 | 7 Aug 202620:52 | – | attackerkb |
 | CVE-2026-54338 | 7 Aug 202620:52 | – | cve |
 | EUVD-2026-54678 | 7 Aug 202620:52 | – | euvd |
 | CVE-2026-54338 | 7 Aug 202621:17 | – | nvd |
[
{
"vendor": "jupyterhub",
"product": "jupyterhub",
"versions": [
{
"version": "< 5.5.0JupyterHub 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.",
"status": "affected"
}
]
}
]Data
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07 Aug 2026 20:52Current
CVSS 3.15.3