CVE-2026-47737

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{"bugzilla": {"description": "puma: Puma: Source IP spoofing via PROXY protocol header re-parsing", "id": "2500584", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2500584"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-358", "details": ["A flaw was found in Puma, a Ruby/Rack web server. When `set_remote_address proxy_protocol: :v1` is enabled and persistent connections are used, Puma incorrectly re-parses PROXY protocol headers after each keep-alive request on the same connection. This allows a remote attacker to inject a second PROXY header, leading to source IP (Internet Protocol) spoofing and potentially impacting security logging or access control decisions."], "mitigation": {"lang": "en:us", "value": "Upgrade puma to 7.2.1 or 8.0.2 (or later). If an immediate upgrade is not possible, remove the `set_remote_address proxy_protocol: :v1` configuration, or disable persistent connections (`enable_keep_alives false`), to prevent PROXY protocol v1 header re-parsing on the same connection."}, "name": "CVE-2026-47737", "package_state": [{"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Not affected", "package_name": "3scale-amp21/backend", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Not affected", "package_name": "3scale-amp21/zync", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Not affected", "package_name": "3scale-amp22/backend", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Not affected", "package_name": "3scale-amp22/zync", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Not affected", "package_name": "3scale-amp2/backend-rhel8", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Not affected", "package_name": "3scale-amp2/zync-rhel8", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Not affected", "package_name": "3scale-amp2/zync-rhel9", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "pcs", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "pcs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "pcs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "rubygem-puma", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "satellite:el8/rubygem-puma", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-07-14T19:45:16Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-47737\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-47737\nhttps://github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f\nhttps://github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58\nhttps://github.com/puma/puma/pull/3944\nhttps://github.com/puma/puma/pull/3947\nhttps://github.com/puma/puma/releases/tag/v7.2.1\nhttps://github.com/puma/puma/releases/tag/v8.0.2\nhttps://github.com/puma/puma/security/advisories/GHSA-2vqw-3mp8-cgmx"], "statement": "This flaw only affects Puma deployments that explicitly enable `set_remote_address proxy_protocol: :v1` together with persistent (keep-alive) connections to the proxy. This is not Puma default configuration.", "threat_severity": "Important"}

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