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Puma PROXY Protocol v1 Accepts Repeated Protocol Headers on Persistent Connections

🗓️ 27 May 2026 00:00:00Reported by RubySecType 
rubygems
 rubygems
🔗 rubysec.com👁 25 Views

Puma Proxy Protocol Version One on persistent connections can spoof REMOTE_ADDR by re-parsing headers.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-47737
14 Jul 202619:45
–attackerkb
cgr
Chainguard
CVE-2026-47737 vulnerabilities
10 Jun 202607:25
–cgr
cve
CVE
CVE-2026-47737
14 Jul 202619:45
–cve
cvelist
Cvelist
CVE-2026-47737 Puma PROXY Protocol v1 Accepts Repeated Protocol Headers on Persistent Connections
14 Jul 202619:45
–cvelist
debian
Debian
[SECURITY] [DLA 4826-1] puma security update
7 Oct 202610:36
–debian
debiancve
Debian CVE
CVE-2026-47737
14 Jul 202619:45
–debiancve
nessus
Tenable Nessus
Debian dla-4826 : puma - security update
7 Oct 202600:00
–nessus
nessus
Tenable Nessus
TencentOS Server 4: pcs (TSSA-2026:0801)
12 Aug 202600:00
–nessus
nessus
Tenable Nessus
Linux Distros Unpatched Vulnerability : CVE-2026-47737
16 Jul 202600:00
–nessus
euvd
EUVD
EUVD-2026-44427
14 Jul 202619:45
–euvd
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Vulners
Node
OR
rubypumaRange7.2.0–7.2.1
rubypumaRange≤8.0.2

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27 May 2026 00:00Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.17.5
EPSS0.00177
SSVC
25