{"action":"Upgrade puma to 3.12.4-1 or later.","affected":[{"fixed":"3.12.4-1","introduced":"0"}],"component":"puma","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["3.12.4-1"],"id":"tcs_01M5NF4FSR6EF34XCRB3AV6BRC","modified_at":"2026-09-11T11:02:35.382460276Z","published_at":"2020-02-28T17:15:12.220Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2020-5247","https://security-tracker.debian.org/tracker/CVE-2020-5247"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2020-5247#Debian:14/puma","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2020-5247"}],"summary":"In Puma (RubyGem) before 4.3.2 and before 3.12.3, if an application using Puma allows untrusted input in a response header, an attacker can use newline characters (i.e. `CR`, `LF` or`/r`, `/n`) to end"}