{"id":"DEBIAN-CVE-2026-108752","details":"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.","modified":"2026-10-12T08:00:07.079349060Z","published":"2026-10-11T13:17:20.097Z","upstream":["CVE-2026-108752"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-108752"}],"affected":[{"package":{"name":"jupyterhub","ecosystem":"Debian:12","purl":"pkg:deb/debian/jupyterhub?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.0+ds1-1","5.0.0+ds1-1","5.0.0+ds1-2","5.0.0+ds1-3","5.0.0+ds1-4","5.2.1+ds1-1","5.2.1+ds1-2","5.2.1+ds1-3","5.2.1+ds1-4","5.2.1+ds1-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-108752.json"}},{"package":{"name":"jupyterhub","ecosystem":"Debian:13","purl":"pkg:deb/debian/jupyterhub?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2.1+ds1-4","5.2.1+ds1-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-108752.json"}},{"package":{"name":"jupyterhub","ecosystem":"Debian:14","purl":"pkg:deb/debian/jupyterhub?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2.1+ds1-4","5.2.1+ds1-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-108752.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L"}]}