{"action":"Upgrade libcoap3 to 4.3.5-2 or later.","affected":[{"fixed":"4.3.5-2","introduced":"0"}],"component":"libcoap3","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["4.3.5-2"],"id":"tcs_01M5NP6FRQPR9G2S9CVJ4VBK1P","modified_at":"2026-09-01T20:05:55.831791153Z","published_at":"2025-11-24T14:15:47.500Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2025-65498","https://security-tracker.debian.org/tracker/CVE-2025-65498"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2025-65498#Debian:14/libcoap3","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2025-65498"}],"summary":"NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_"}