GHSA-3vff-hjqv-m7h8
MEDIUMGHSA-3vff-hjqv-m7h8 is a medium-severity (CVSS 6.1) Open Redirect vulnerability in jupyterhub. O3 Security confirms whether GHSA-3vff-hjqv-m7h8 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
JupyterHub has an Open Redirect Vulnerability
Blast Radius
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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 Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | jupyterhub | all versions | 5.4.4 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for jupyterhub. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update jupyterhub to 5.4.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3vff-hjqv-m7h8 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-3vff-hjqv-m7h8 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-3vff-hjqv-m7h8. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-3vff-hjqv-m7h8 in your dependencies?
O3 detects GHSA-3vff-hjqv-m7h8 across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.