This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-47737 →

DEBIAN-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_remote_addre...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 puma

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.6.5-3+deb12u2"}]}]

Debian:13 puma

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 puma

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.2-1"}]}]

References

advisory security-tracker.debian.org