{"action":"Upgrade jupyterhub to 5.4.4 or later.","affected":[{"fixed":"5.4.4","introduced":"0"}],"component":"jupyterhub","cve_ids":["CVE-2026-33709"],"ecosystem":"PyPI","epss":0.00206,"exploited":false,"fixed_versions":["5.4.4"],"ghsa_id":"GHSA-3vff-hjqv-m7h8","id":"tcs_01M5KGXZ4MD949B8VJT6EDYVGV","modified_at":"2026-07-13T07:26:28.413653255Z","published_at":"2026-04-03T22:16:26.657Z","references":["https://osv.dev/vulnerability/PYSEC-2026-2188","https://github.com/jupyterhub/jupyterhub/releases/tag/5.4.4","https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-3vff-hjqv-m7h8"],"severity":{"label":"medium","score":6.1},"sources":[{"source":"osv","source_id":"PYSEC-2026-2188","url":"https://osv.dev/vulnerability/PYSEC-2026-2188"}],"summary":"JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Prior to version 5.4.4, an open redirect vulnerability in JupyterHub allows attackers to construct links whi"}