GHSA-93gc-h923-mp36:
JupyterHub vulnerability analysis and mitigation

Impact

In deployments where users can signup with arbitrary usernames (not most deployments), certain malicious usernames could interfere with URL handling.

Upgrade to JupyterHub 5.5.3 or 6.1.0

Set Authenticator.username_regex to a reasonable pattern.

Source: NVD

CVE ID	Severity	Score	Technologies	Component name	CISA KEV exploit	Has fix	Published date
GHSA-hx46-2cv3-mh6g	MEDIUM	6.5	JupyterHub	jupyterhub	No	Yes	Oct 21, 2026
GHSA-x7xh-7hc7-9436	MEDIUM	6.1	JupyterHub	jupyterhub	No	Yes	Oct 21, 2026
GHSA-5jhc-4h3c-q97h	MEDIUM	4.1	JupyterHub	jupyterhub	No	Yes	Oct 21, 2026
GHSA-93gc-h923-mp36	MEDIUM	N/A	JupyterHub	jupyterhub	No	Yes	Oct 21, 2026
GHSA-r764-xgvf-jrfj	MEDIUM	N/A	JupyterHub	jupyterhub	No	Yes	Oct 21, 2026

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