puma: Puma is a Ruby/Rack web server built for parallelism
CVE-2026-47737 is fixed in puma on 1 platform, first by DEBIAN-CVE-2026-47737, released July 18, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| puma · Debian 12.15 (bookworm) | 5.6.5-3+deb12u2 | DEBIAN-CVE-2026-47737 | Jul 18, 2026 |
| puma · Debian 14 | 8.0.2-1 | DEBIAN-CVE-2026-47737 | Jul 18, 2026 |
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