{"action":"Upgrade puma to 4.3.8-1 or later.","affected":[{"fixed":"4.3.8-1","introduced":"0"}],"component":"puma","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["4.3.8-1"],"id":"tcs_01M5NFJED0Z5TVX6RN38JS6W32","modified_at":"2026-10-23T18:03:12.779072124Z","published_at":"2021-05-11T17:15:07.627Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-29509","https://security-tracker.debian.org/tracker/CVE-2021-29509"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-29509#Debian:13/puma","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-29509"}],"summary":"Puma is a concurrent HTTP 1.1 server for Ruby/Rack applications. The fix for CVE-2019-16770 was incomplete. The original fix only protected existing connections that had already been accepted from hav"}