Security Advisory

CVE-2026-47737

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-14 19:45:16

Last updated 2026-07-15 14:10:20

Assigner GitHub_M

CVSS score 7.5

State PUBLISHED

Description

Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, Puma is vulnerable to source IP spoofing when set_remote_address proxy_protocol: :v1 is enabled and persistent connections are used because Puma incorrectly re-parses PROXY protocol headers after each keep-alive request on the same connection, allowing an attacker to inject a second PROXY header and overwrite REMOTE_ADDR. This issue is fixed in versions 7.2.1 and 8.0.2.

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