CVE-2026-47737

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Source
https://cve.org/CVERecord?id=CVE-2026-47737
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47737.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-47737
Aliases
Downstream
Related
Published
2026-07-14T19:45:16.648Z
Modified
2026-07-17T03:41:51.831728544Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
Puma PROXY Protocol v1 Accepts Repeated Protocol Headers on Persistent Connections
Details

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 setremoteaddress proxyprotocol: :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 REMOTEADDR. This issue is fixed in versions 7.2.1 and 8.0.2.

Database specific 
{
    "cwe_ids": [
        "CWE-290",
        "CWE-345"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47737.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/puma/puma

Affected ranges

Type
GIT
Repo
https://github.com/puma/puma
Events
Introduced
21e0443cca4a53c8f0f97fe5197423031cab3610
Introduced
fcf3173a2eed8d350377891008a41630d976f3d9
Fixed
92754ace040db67622f0e6406dea0b47c94d0139
Fixed
8085b75e79e3f7f1a96e5b488d74a71f62edd24d
Fixed
439c6136d9c2275721b7864db3ee78af7c80889f
Fixed
ebe9db3929ab8299d19c8f5b41e8ef4f4b22fa58
Database specific 
{
    "extracted_events": [
        {
            "introduced": "5.5.0"
        },
        {
            "fixed": "7.2.1"
        },
        {
            "introduced": "8.0.0"
        },
        {
            "fixed": "8.0.2"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v5.*
v5.5.0
v5.5.1
v5.5.2
v5.6.0
v5.6.1
v5.6.3
v6.*
v6.0.0
v6.0.1
v6.0.2
v6.1.0
v6.2.0
v6.2.1
v6.2.2
v6.3.0
v6.4.0
v6.5.0
v6.6.0
v6.6.1
v7.*
v7.0.0
v7.0.0.pre1
v7.0.1
v7.0.2
v7.0.3
v7.0.4
v7.1.0
v7.2.0
v8.*
v8.0.0
v8.0.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47737.json"