Allocation of Resources Without Limits or Throttling Affecting puma package, versions >=5.5.0, <7.2.1>=8.0.0, <8.0.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published7 Jun 2026
- disclosed5 Jun 2026
- creditTomoya Yamashita
Introduced: 5 Jun 2026
CVE-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.