CVE-2021-41247 json
incomplete logout in JupyterHub
published 5y ago modified 2mo ago also BIT-jupyterhub-2021-41247 , EUVD-2021-0105 , GHSA-cw7p-q79f-m2v7 , PYSEC-2021-386
- cvss
- 3.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 57%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi jupyterhub 1.5.0
- bitnami jupyterhub 1.5.0
- jupyter jupyterhub 1.5.0
- jupyterhub Debian 14, Debian 13, Debian 12 2.0.0+ds1-1
debian advisories DEBIAN-CVE-2021-41247
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red hat product security vex CVE-2021-41247 updated cvss 7.5
juptyerhub: Incomplete JupyterHub logout with simultaneous JupyterLab sessions
-
Red Hat All currently supported Red Hat productsnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
0.80% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N |
| GitHub | 3.1 | 3.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | jupyterhub | >=1.0.0, <1.5.0 |
1.5.0 |
| bitnami | jupyterhub | >=1.0.0, <1.5.0 |
1.5.0 |
Affected products
- jupyterhub jupyterhub
Classification
- Weakness
-
- CWE-613 DEPRECATED: Insufficient Session Expiration
References
-
github.com
/jupyterhub/jupyterhub/commit/5ac9e7f73a6e1020ffddc40321fc53336829fe27
web, patch, third-party-advisory, advisory
-
github.com
/jupyterhub/jupyterhub/security/advisories/GHSA-cw7p-q79f-m2v7
web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-41247
advisory, web
-
github.com
/jupyterhub/jupyterhub
package
-
github.com
/pypa/advisory-database/tree/main/vulns/jupyterhub/PYSEC-2021-386.yaml
web
Sources
- CVE List CVE-2021-41247
- GitHub Advisory GHSA-cw7p-q79f-m2v7
- NVD CVE-2021-41247
- OSV BIT-jupyterhub-2021-41247
- OSV PYSEC-2021-386
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.