CVE-2026-47736 | THREATINT

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.

PUBLISHED Reserved 2026-05-19 | Published 2026-07-14 | Updated 2026-07-14 | Assigner GitHub_M

HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-400: Uncontrolled Resource Consumption

Product status

>= 5.5.0, < 7.2.1

affected

>= 8.0.0, < 8.0.2

affected

References

github.com/puma/puma/security/advisories/GHSA-qpgp-93vx-g8v8

github.com/...ommit/439c6136d9c2275721b7864db3ee78af7c80889f

github.com/...ommit/ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58

github.com/puma/puma/releases/tag/v7.2.1

github.com/puma/puma/releases/tag/v8.0.2

cve.org (CVE-2026-47736)

nvd.nist.gov (CVE-2026-47736)

Download JSON