{"action":"Upgrade puma to 3.12.0-4 or later.","affected":[{"fixed":"3.12.0-4","introduced":"0"}],"component":"puma","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["3.12.0-4"],"id":"tcs_01M5NDZM3SDJSYSER2FVSVCCYJ","modified_at":"2026-09-21T07:02:28.640083727Z","published_at":"2019-12-05T20:15:10.093Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2019-16770","https://security-tracker.debian.org/tracker/CVE-2019-16770"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2019-16770#Debian:13/puma","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2019-16770"}],"summary":"In Puma before versions 3.12.2 and 4.3.1, a poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack. If more keepalive connections to Puma"}