What is GHSA-3vff-hjqv-m7h8?

GHSA-3vff-hjqv-m7h8 is a security advisory published by GitHub Security Advisories with Medium severity. JupyterHub has an Open Redirect Vulnerability

Which CVE IDs does GHSA-3vff-hjqv-m7h8 cover?

GHSA-3vff-hjqv-m7h8 covers the following CVE IDs: CVE-2026-33709. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-3vff-hjqv-m7h8?

GHSA-3vff-hjqv-m7h8 has a CVSS v3 base score of 6.1, published by GitHub Security Advisories.

Which products are affected by GHSA-3vff-hjqv-m7h8?

GHSA-3vff-hjqv-m7h8 affects 1 product, including: pip/jupyterhub:\u003c= 5.4.3.

GHSA-3vff-hjqv-m7h8MediumCVSS 6.1

JupyterHub has an Open Redirect Vulnerability

Vendor

GitHub Security Advisories

Published

April 3, 2026

Last Modified

April 27, 2026

🔗 CVE IDs covered (1)

CVE-2026-33709 →

📋 Description

Affected Version

JupyterHub <= 5.4.3

Impact

An open redirect vulnerability in JupyterHub <=5.4.3 allows attackers to construct links which, when clicked, take users to the JupyterHub login page, after which they are sent to an arbitrary attacker-controlled site outside JupyterHub instead of a JupyterHub page, bypassing JupyterHub's check to prevent this.

Patches

Upgrade to JupyterHub 5.4.4

Workarounds

A deployment can apply filters on the Location header in a reverse proxy such as nginx/apache/traefik.

🎯 Affected products1

pip/jupyterhub:<= 5.4.3

🔗 References (4)

https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-3vff-hjqv-m7h8
https://nvd.nist.gov/vuln/detail/CVE-2026-33709
https://github.com/jupyterhub/jupyterhub/releases/tag/5.4.4
https://github.com/advisories/GHSA-3vff-hjqv-m7h8