{"action":"Upgrade unbound to 1.26.1-0+deb13u1 or later.","affected":[{"fixed":"1.26.1-0+deb13u1","introduced":"0"}],"component":"unbound","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["1.26.1-0+deb13u1"],"id":"tcs_01M5NVVZJ6QZSNTP9B8894C470","modified_at":"2026-09-24T08:47:27.180283001Z","published_at":"2026-09-16T09:17:06.210Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-81634","https://security-tracker.debian.org/tracker/CVE-2026-81634"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-81634#Debian:13/unbound","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-81634"}],"summary":"In NLnet Labs Unbound up to and including 1.26.0, a 255 length query name with a large TCP response can lead to a heap buffer overflow during the RRSet canonicalisation routine. This is caused by miss"}