CVE-2021-41247— incomplete logout in JupyterHub
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I. Basic Information for CVE-2021-41247
Vulnerability Information
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Vulnerability Title
incomplete logout in JupyterHub
Source: NVD (National Vulnerability Database)
Vulnerability Description
JupyterHub is an open source multi-user server for Jupyter notebooks. In affected versions users who have multiple JupyterLab tabs open in the same browser session, may see incomplete logout from the single-user server, as fresh credentials (for the single-user server only, not the Hub) reinstated after logout, if another active JupyterLab session is open while the logout takes place. Upgrade to JupyterHub 1.5. For distributed deployments, it is jupyterhub in the _user_ environment that needs patching. There are no patches necessary in the Hub environment. The only workaround is to make sure that only one JupyterLab tab is open when you log out.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
不充分的会话过期机制
Source: NVD (National Vulnerability Database)
Vulnerability Title
JupyterHub 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JupyterHub是一款用于Jupyter的多用户服务器。 JupyterHub 存在安全漏洞，该漏洞源于在受影响的版本中，在同一个浏览器会话中打开多个 JupyterLab 选项卡的用户可能会看到从单用户服务器注销不完整，因为新凭据（仅适用于单用户服务器，而不是集线器）在注销后恢复，如果另一个活动 JupyterLab 会话在注销时打开。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| jupyterhub | jupyterhub | >= 1.0.0, < 1.5.0 - jupyterhub (pip) | - |
II. Public POCs for CVE-2021-41247
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same vendor: jupyterhub
- CVE-2026-34052
LTI JupyterHub Authenticator: Unbounded Memory Growth via No - CVE-2026-33709
JupyterHub has an Open Redirect Vulnerability - CVE-2026-33175
OAuthenticator: Authentication Bypass in Auth0OAuthenticator - CVE-2025-32428
Jupyter Remote Desktop Proxy makes TigerVNC accessible via t - CVE-2023-25574
JupyterHub's LTI13Authenticator: JWT signature not validated
Same weakness: CWE-613
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CI4MS: Deactivated User Session Bypass (active=0) - CVE-2026-40934
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V. Comments for CVE-2021-41247
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