CVE-2021-41247

unknown

Published 2021-11-08 · Modified 2023-12-06

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

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CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N

CVSS v4 NEW

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not yet in upstream

VIR risk

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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.

Predictions

Exploit likelihood

30%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Debian Fixed 4 releases

Version	Status	Fixed in
trixie	Fixed	`2.0.0+ds1-1`
sid	Fixed	`2.0.0+ds1-1`
forky	Fixed	`2.0.0+ds1-1`
bookworm	Fixed	`2.0.0+ds1-1`

Package impact

Ecosystem	Package	Vulnerable	Fixed
PyPI	jupyterhub	`>=1.0.0,<1.5.0`	`1.5.0`
PyPI	jupyterhub	`<5ac9e7f73a6e1020ffddc40321fc53336829fe27\|\|>=1.0.0,<1.5.0`	`5ac9e7f73a6e1020ffddc40321fc53336829fe27`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.