This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-47736 →

DEBIAN-CVE-2026-47736

Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, when PROXY protocol v1 support is enabled, Puma reads incoming...

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, when PROXY protocol v1 support is enabled, Puma reads incoming bytes into an internal buffer while waiting for CRLF to determine whether a PROXY v1 line is present, allowing an attacker that continuously sends bytes without CRLF to cause unbounded in-process memory growth and additional CPU cost from repeatedly scanning the growing buffer. 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