Open Redirect Affecting jupyterhub package, versions [,5.4.4)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-PYTHON-JUPYTERHUB-15907592
- published5 Apr 2026
- disclosed3 Apr 2026
- creditRacerZ-fighting, Fushuling
Introduced: 3 Apr 2026
CVE-2026-33709 (opens in a new tab)How to fix?
Upgrade jupyterhub to version 5.4.4 or higher.
Overview
jupyterhub is a JupyterHub: A multi-user server for Jupyter notebooks
Affected versions of this package are vulnerable to Open Redirect via the login page. An attacker can redirect users to an external site by crafting a malicious link that, when followed, causes the user to be sent to an attacker-controlled destination after authentication.
Workaround
This vulnerability can be mitigated by applying filters on the Location header in a reverse proxy such as nginx, apache, or traefik.