{"id":"DEBIAN-CVE-2026-47737","details":"Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, Puma is vulnerable to source IP spoofing when set_remote_address proxy_protocol: :v1 is enabled and persistent connections are used because Puma incorrectly re-parses PROXY protocol headers after each keep-alive request on the same connection, allowing an attacker to inject a second PROXY header and overwrite REMOTE_ADDR. This issue is fixed in versions 7.2.1 and 8.0.2.","modified":"2026-09-01T16:06:47.453725773Z","published":"2026-07-14T20:17:03.767Z","upstream":["CVE-2026-47737"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-47737"}],"affected":[{"package":{"name":"puma","ecosystem":"Debian:12","purl":"pkg:deb/debian/puma?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.6.5-3","5.6.5-3+deb12u1","5.6.5-4","5.6.7-1","6.0.2-1","6.4.0-1","6.4.0-2","6.4.0-3","6.4.0-4","6.4.2-1","6.4.2-2","6.4.2-3","6.4.2-4","6.4.2-5","6.4.2-6","6.4.3-1","6.4.3-2","6.4.3-3","6.6.0-1","6.6.0-2","6.6.0-3","6.6.0-4","8.0.2-1","8.0.2-2","8.0.2-3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47737.json"}},{"package":{"name":"puma","ecosystem":"Debian:13","purl":"pkg:deb/debian/puma?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.6.0-4","8.0.2-1","8.0.2-2","8.0.2-3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47737.json"}},{"package":{"name":"puma","ecosystem":"Debian:14","purl":"pkg:deb/debian/puma?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.2-1"}]}],"versions":["6.6.0-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47737.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}