Allocation of Resources Without Limits or Throttling Affecting puma package, versions >=5.5.0, <7.2.1>=8.0.0, <8.0.2
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- published7 Jun 2026
- disclosed5 Jun 2026
- creditTomoya Yamashita
Introduced: 5 Jun 2026
NewCVE-2026-47736 (opens in a new tab)How to fix?
Upgrade puma to version 7.2.1, 8.0.2 or higher.
Overview
puma is a simple, fast, threaded, and highly concurrent HTTP 1.1 server for Ruby/Rack applications. Puma is intended for use in both development and production environments. It's great for highly concurrent Ruby implementations such as Rubinius and JRuby as well as as providing process worker support to support CRuby well.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling when parsing PROXY protocol v1 data. When the server is configured with the non-default set_remote_address proxy_protocol: :v1, an attacker can cause excessive CPU consumption by continuously sending data without a \r\n/CRLF sequence over a TCP connection.