{"action":"Upgrade libcoap3 to 4.3.4-1.1+deb13u3 or later.","affected":[{"fixed":"4.3.4-1.1+deb13u3","introduced":"0"}],"component":"libcoap3","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["4.3.4-1.1+deb13u3"],"id":"tcs_01M5NNBE1J9J9ZDXHPH5RHQPW1","modified_at":"2026-09-24T08:47:31.430423472Z","published_at":"2025-12-31T19:15:43.923Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2025-34468","https://security-tracker.debian.org/tracker/CVE-2025-34468"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2025-34468#Debian:13/libcoap3","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2025-34468"}],"summary":"libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostname data is copied into a fixed 256-byte"}