VYPR
High severity7.5NVD Advisory· Published Jul 14, 2026· Updated Jul 15, 2026

CVE-2026-47737

CVE-2026-47737

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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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
pumaRubyGems
>= 8.0.0, < 8.0.28.0.2
pumaRubyGems
>= 5.5.0, < 7.2.17.2.1

Affected products

24

Patches

Vulnerability mechanics

References

10

News mentions

0

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