{"action":"Upgrade upx-ucl to 3.96-1 or later.","affected":[{"fixed":"3.96-1","introduced":"0"}],"component":"upx-ucl","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["3.96-1"],"id":"tcs_01M5NE43EPQWV2GWM5VSGMB8T5","modified_at":"2026-09-21T07:00:41.561778152Z","published_at":"2019-12-27T02:15:10.797Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2019-20021","https://security-tracker.debian.org/tracker/CVE-2019-20021"],"severity":{"label":"medium","score":5.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2019-20021#Debian:14/upx-ucl","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2019-20021"}],"summary":"A heap-based buffer over-read was discovered in canUnpack in p_mach.cpp in UPX 3.95 via a crafted Mach-O file."}