{"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_01M5NP6E24NGVKXKFS09AFJRNP","modified_at":"2026-09-01T20:05:55.838738639Z","published_at":"2025-11-24T14:15:46.743Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2025-65493","https://security-tracker.debian.org/tracker/CVE-2025-65493"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2025-65493#Debian:14/libcoap3","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2025-65493"}],"summary":"NULL pointer dereference in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS/TLS connection that triggers BIO_get_data() to return NULL."}