{"action":"Upgrade mapserver to 5.4.2-1 or later.","affected":[{"fixed":"5.4.2-1","introduced":"0"}],"component":"mapserver","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["5.4.2-1"],"id":"tcs_01M5N98EXPX4DVFDFGDCH33MVZ","modified_at":"2026-10-23T17:47:21.487446125Z","published_at":"2009-03-31T18:24:45.860Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2009-0840","https://security-tracker.debian.org/tracker/CVE-2009-0840"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2009-0840#Debian:13/mapserver","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2009-0840"}],"summary":"Heap-based buffer underflow in the readPostBody function in cgiutil.c in mapserv in MapServer 4.x before 4.10.4 and 5.x before 5.2.2 allows remote attackers to have an unknown impact via a negative va"}