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{}

{"bugzilla": {"description": "puma: Puma: Denial of Service due to unbounded memory growth in PROXY protocol v1", "id": "2500583", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2500583"}, "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:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in Puma, a Ruby/Rack web server. When PROXY protocol v1 support is enabled, a remote attacker can continuously send data without proper termination. This causes the server to consume an increasing amount of memory and CPU resources, leading to a Denial of Service (DoS) where the server becomes unresponsive or crashes."], "mitigation": {"lang": "en:us", "value": "Upgrade to Puma 7.2.1 (7.x branch) or 8.0.2 (8.x branch), whichever applies to the deployed release line. If an immediate upgrade is not possible, remove or comment out the set_remote_address proxy_protocol: :v1 configuration directive if it is not required, or restrict direct network access to the affected Puma listener to trusted load balancers or reverse proxies only."}, "name": "CVE-2026-47736", "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": "2026-07-14T19:54:26Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-47736\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-47736\nhttps://github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f\nhttps://github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58\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-qpgp-93vx-g8v8"], "statement": "This issue only affects Puma deployments that explicitly enable the non-default proxy_protocol: :v1 remote-address configuration (set_remote_address proxy_protocol: :v1). An unauthenticated network attacker able to open a TCP connection to such a listener can send bytes without a terminating CRLF, causing unbounded growth of an internal pre-parse buffer and a potential denial of service. Deployments that do not enable this configuration are not affected by this specific issue.", "threat_severity": "Important"}