{"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:13","exploited":false,"fixed_versions":["1.8.6-1"],"id":"tcs_01M5NE46RA353WENMM1B9JZ3FF","modified_at":"2026-09-21T07:03:17.687212610Z","published_at":"2019-12-29T19:15:11.167Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2019-20056","https://security-tracker.debian.org/tracker/CVE-2019-20056"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2019-20056#Debian:13/libsixel","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2019-20056"}],"summary":"stb_image.h (aka the stb image loader) 2.23, as used in libsixel and other products, has an assertion failure in stbi__shiftsigned."}