{"action":"Upgrade unbound to 1.22.0-2 or later.","affected":[{"fixed":"1.22.0-2","introduced":"0"}],"component":"unbound","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["1.22.0-2"],"id":"tcs_01M5NP3VKYAYFRTTJDCQ33GD87","modified_at":"2026-09-01T20:05:55.101892380Z","published_at":"2025-07-16T15:15:33.490Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2025-5994","https://security-tracker.debian.org/tracker/CVE-2025-5994"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2025-5994#Debian:13/unbound","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2025-5994"}],"summary":"A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet (ECS). Unbound is also vulnerable when compiled with ECS"}