CVE-2026-47737: Ruby Puma Proxy Protocol Spoofing
Puma resets the proxy protocol parsing flag on every request over a persistent connection. This allows an attacker to inject a second PROXY protocol header in a subsequent keep-alive request, overwriting the connection's REMOTE_ADDR metadata and leading to IP spoofing. The fix ensures PROXY parsing only occurs on the first request (`@requests_served.zero?`).
Rubygreprules fetch cve-2026-47737-ruby-puma-proxy-protocol-spoofing --engine opengrepDescription
Puma resets the proxy protocol parsing flag on every request over a persistent connection. This allows an attacker to inject a second PROXY protocol header in a subsequent keep-alive request, overwriting the connection's REMOTE_ADDR metadata and leading to IP spoofing. The fix ensures PROXY parsing only occurs on the first request (`@requests_served.zero?`).
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