{"action":"Upgrade upx-ucl to 4.2.2-1 or later.","affected":[{"fixed":"4.2.2-1","introduced":"0"}],"component":"upx-ucl","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["4.2.2-1"],"id":"tcs_01M5NFK8DXV48FS73MP4ZHRR30","modified_at":"2026-10-23T18:03:26.084313928Z","published_at":"2021-05-27T00:15:08.483Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-30500","https://security-tracker.debian.org/tracker/CVE-2021-30500"],"severity":{"label":"high","score":7.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-30500#Debian:14/upx-ucl","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-30500"}],"summary":"Null pointer dereference was found in upx PackLinuxElf::canUnpack() in p_lx_elf.cpp,in version UPX 4.0.0. That allow attackers to execute arbitrary code and cause a denial of service via a crafted fil"}