What is GHSA-p43p-whwx-q52h?

GHSA-p43p-whwx-q52h is a security advisory published by GitHub Security Advisories with Medium severity. JupyterHub has Unauthenticated Denial of Service via Unbounded Username Logging on Failed Login

Which CVE IDs does GHSA-p43p-whwx-q52h cover?

GHSA-p43p-whwx-q52h covers the following CVE IDs: CVE-2026-54338. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-p43p-whwx-q52h?

GHSA-p43p-whwx-q52h has a CVSS v3 base score of 5.3, published by GitHub Security Advisories.

Which products are affected by GHSA-p43p-whwx-q52h?

GHSA-p43p-whwx-q52h affects 1 product, including: pip/jupyterhub:\u003c 5.5.0.

GHSA-p43p-whwx-q52hMediumCVSS 5.3

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

Vendor

GitHub Security Advisories

Published

August 25, 2026

Last Modified

August 25, 2026

🔗 CVE IDs covered (1)

CVE-2026-54338 →

📋 Description

Impact

Invalid input to login resulted in unbounded logging output. Only form-based Authenticators (the default PAM Authenticator, but not the more widely used OAuthenticator) are affected.

Patches

Upgrade to 5.5.0.

Workarounds

Use an Authenticator that doesn't use a login form, such as OAuthenticator.

🎯 Affected products1

pip/jupyterhub:< 5.5.0

🔗 References (4)

https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-p43p-whwx-q52h
https://nvd.nist.gov/vuln/detail/CVE-2026-54338
https://github.com/jupyterhub/jupyterhub/commit/d6dc595f84b7509969686da31d87d6d69e7fce0a
https://github.com/advisories/GHSA-p43p-whwx-q52h