{"id":"DEBIAN-CVE-2026-54338","details":"JupyterHub is software that allows users to create a multi-user server for Jupyter notebooks. Prior to 5.5.0, invalid input to form-based login authenticators can place an unbounded attacker-controlled username in failed-login logs, allowing an unauthenticated attacker to consume logging and storage resources. This issue is fixed in version 5.5.0.","modified":"2026-09-10T08:47:25.382682741Z","published":"2026-08-07T21:17:29.017Z","upstream":["CVE-2026-54338"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-54338"}],"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-2026-54338.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-2026-54338.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-2026-54338.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}