{"action":"Upgrade libsixel to 1.8.6-1 or later.","affected":[{"fixed":"1.8.6-1","introduced":"0"}],"component":"libsixel","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["1.8.6-1"],"id":"tcs_01M5NESHDSD4BH2HPNB38BD9MD","modified_at":"2026-10-26T12:02:30.301278850Z","published_at":"2021-08-10T21:15:07.447Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2020-21677","https://security-tracker.debian.org/tracker/CVE-2020-21677"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2020-21677","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2020-21677"}],"summary":"A heap-based buffer overflow in the sixel_encoder_output_without_macro function in encoder.c of Libsixel 1.8.4 allows attackers to cause a denial of service (DOS) via converting a crafted PNG file int"}