CVE-2026-33709

Description

JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Prior to version 5.4.4, an open redirect vulnerability in JupyterHub 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. This issue has been patched in version 5.4.4.

PUBLISHED Reserved 2026-03-23 | Published 2026-04-03 | Updated 2026-04-06 | Assigner GitHub_M

Problem types

CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

Product status

References

github.com/...terhub/security/advisories/GHSA-3vff-hjqv-m7h8

github.com/jupyterhub/jupyterhub/releases/tag/5.4.4

cve.org (CVE-2026-33709)

nvd.nist.gov (CVE-2026-33709)

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