{"action":"Upgrade courier to 0.53.2-1 or later.","affected":[{"fixed":"0.53.2-1","introduced":"0"}],"component":"courier","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["0.53.2-1"],"id":"tcs_01M5N8M0KJ3XV62H1HHWRHTZKD","modified_at":"2026-10-22T23:47:22.436121945Z","published_at":"2006-05-30T19:02:00Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2006-2659","https://security-tracker.debian.org/tracker/CVE-2006-2659"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2006-2659#Debian:14/courier","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2006-2659"}],"summary":"libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU consumption) via unknown vectors involving usernames that contain the \"=\" (equals) character, which is no"}