CVE catalog
CVE-2021-41247
jupyterhub: CVE-2021-41247
- Severity
- Medium
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.80% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | jupyterhub | sid | 5.2.1+ds1-5 | fixed |
| Debian | jupyterhub | forky | 5.2.1+ds1-5 | fixed |
| Debian | jupyterhub | trixie | 5.2.1+ds1-4 | fixed |
| Debian | jupyterhub | bookworm | 3.0.0+ds1-1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | jupyterhub | source | sid | 2.0.0+ds1-1 | not yet assigned | Not reported | Not reported |
| Debian | jupyterhub | source | forky | 2.0.0+ds1-1 | not yet assigned | Not reported | Not reported |
| Debian | jupyterhub | source | trixie | 2.0.0+ds1-1 | not yet assigned | Not reported | Not reported |
| Debian | jupyterhub | source | bookworm | 2.0.0+ds1-1 | not yet assigned | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [jupyterhub]Fixed
Details (2)
3.0.0+ds1-1· all · bookwormFixed · Fixed:
2.0.0+ds1-1dsa · jupyterhub · debian · bookworm; dsa · jupyterhub · debian · 12
3.0.0+ds1-1· all · bookwormFixed · Fixed:
2.0.0+ds1-1dsa · jupyterhub · debian · bookworm; dsa · jupyterhub · debian · 12
[Debian 13 (Trixie)]
- [jupyterhub]Fixed
Details (2)
5.2.1+ds1-4· all · trixieFixed · Fixed:
2.0.0+ds1-1dsa · jupyterhub · debian · 13
5.2.1+ds1-4· all · trixieFixed · Fixed:
2.0.0+ds1-1dsa · jupyterhub · debian · 13
Observed: