CVE-2026-108752

Name	CVE-2026-108752
Description	JupyterHub through 6.0.1 contains an identifier collision vulnerability that allows authenticated users to overwrite another user's named-server OAuth client by registering a hyphenated username. Attackers holding a name like alice-prod can overwrite the client for alice's server prod, breaking OAuth login and revoking tokens by stopping their own server.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
jupyterhub (PTS)	bookworm	3.0.0+ds1-1	vulnerable
	trixie	5.2.1+ds1-4	vulnerable
	forky, sid	5.2.1+ds1-5	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
jupyterhub	source	(unstable)	(unfixed)

https://hackmd.io/@haind/jupyterhub-oauth-client-id-cross-user-collision
check, upstream detail