{"action":"Upgrade ruby-kramdown to 2.3.0-5 or later.","affected":[{"fixed":"2.3.0-5","introduced":"0"}],"component":"ruby-kramdown","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["2.3.0-5"],"id":"tcs_01M5NFHT33RZSDAKEEPGGFSAEG","modified_at":"2026-10-23T18:03:12.653117811Z","published_at":"2021-03-19T07:15:13.147Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-28834","https://security-tracker.debian.org/tracker/CVE-2021-28834"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-28834#Debian:13/ruby-kramdown","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-28834"}],"summary":"Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatters namespace, and thus arbitrary classes can be instantiated."}