JupyterHub has an Open Redirect Vulnerability

中 6.1CVE-2026-33709 · BIT-jupyterhub-2026-33709 · GHSA-3vff-hjqv-m7h8 · 03/04/2026 公開 · 24/07/2026 更新

要点

CVE-2026-33709 は jupyterhub, jupyterhub (jupyter) に影響する深刻度「中」 (CVSS 6.1) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.21%（全脆弱性の 11.8% より高い）。
対処：5.4.4 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
jupyterhub PyPI	`< 5.4.4`	`5.4.4`
jupyterhub jupyter	`< 5.4.4`	`5.4.4`

概要

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.

NVD の説明

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.