{"cve":"CVE-2026-47736","nvd":{"published":"2026-07-14T20:17:03.620","modified":"2026-07-15T18:15:13.373","status":"Deferred","description":"Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, when PROXY protocol v1 support is enabled, Puma reads incoming bytes into an internal buffer while waiting for CRLF to determine whether a PROXY v1 line is present, allowing an attacker that continuously sends bytes without CRLF to cause unbounded in-process memory growth and additional CPU cost from repeatedly scanning the growing buffer. This issue is fixed in versions 7.2.1 and 8.0.2.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400"],"references":["https://github.com/puma/puma/commit/439c6136d9c2275721b7864db3ee78af7c80889f","https://github.com/puma/puma/commit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58","https://github.com/puma/puma/releases/tag/v7.2.1","https://github.com/puma/puma/releases/tag/v8.0.2","https://github.com/puma/puma/security/advisories/GHSA-qpgp-93vx-g8v8"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-47736","score":0.00346,"percentile":0.28189,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-qpgp-93vx-g8v8","url":"https://osv.dev/vulnerability/GHSA-qpgp-93vx-g8v8","summary":"Puma PROXY Protocol v1 Parser Allows Remote Memory Exhaustion ","modified":"2026-09-10T03:50:50.310502895Z","packages":[{"ecosystem":"RubyGems","name":"puma","purl":"pkg:gem/puma","ranges":[">=8.0.0 <8.0.2"],"fixed":["8.0.2"]},{"ecosystem":"RubyGems","name":"puma","purl":"pkg:gem/puma","ranges":[">=5.5.0 <7.2.1"],"fixed":["7.2.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}