CVE WatchJul 15, 2026

CVE-2026-47737

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_re

CVSS

7.5

High

EPSS

0.2%

KEV

—

Exploit Today

0-100

Published: Jul 14, 2026 · Last modified: Jul 15, 2026 · CWE-290 · CWE-345

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-07-152026-07-17

Technical 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.

Official references

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