{"id":"CVE-2026-47737","summary":"Puma PROXY Protocol v1 Accepts Repeated Protocol Headers on Persistent Connections","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.","aliases":["GHSA-2vqw-3mp8-cgmx"],"modified":"2026-07-17T03:41:51.831728544Z","published":"2026-07-14T19:45:16.648Z","related":["CGA-hxjr-48xq-vgjq"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-290","CWE-345"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47737.json"},"references":[{"type":"WEB","url":"https://github.com/puma/puma/releases/tag/v7.2.1"},{"type":"WEB","url":"https://github.com/puma/puma/releases/tag/v8.0.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47737.json"},{"type":"ADVISORY","url":"https://github.com/puma/puma/security/advisories/GHSA-2vqw-3mp8-cgmx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47737"},{"type":"FIX","url":"https://github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f"},{"type":"FIX","url":"https://github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58"},{"type":"FIX","url":"https://github.com/puma/puma/pull/3944"},{"type":"FIX","url":"https://github.com/puma/puma/pull/3947"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/puma/puma","events":[{"introduced":"21e0443cca4a53c8f0f97fe5197423031cab3610"},{"introduced":"fcf3173a2eed8d350377891008a41630d976f3d9"},{"fixed":"92754ace040db67622f0e6406dea0b47c94d0139"},{"fixed":"8085b75e79e3f7f1a96e5b488d74a71f62edd24d"},{"fixed":"439c6136d9c2275721b7864db3ee78af7c80889f"},{"fixed":"ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58"}],"database_specific":{"extracted_events":[{"introduced":"5.5.0"},{"fixed":"7.2.1"},{"introduced":"8.0.0"},{"fixed":"8.0.2"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v7.2.0","v8.0.1","v8.0.0","v7.1.0","v7.0.4","v7.0.3","v7.0.2","v7.0.1","v7.0.0","v6.6.1","v7.0.0.pre1","v6.6.0","v6.5.0","v6.4.0","v6.3.0","v6.2.2","v6.2.1","v6.2.0","v6.1.0","v6.0.2","v6.0.1","v6.0.0","v5.6.3","v5.6.1","v5.6.0","v5.5.2","v5.5.1","v5.5.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47737.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}