UBUNTU-CVE-2026-47737

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Source
https://ubuntu.com/security/CVE-2026-47737
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47737.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-47737
Upstream
Published
2026-07-14T20:17:00Z
Modified
2026-07-15T19:48:19.641945162Z
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
  • Ubuntu - medium
Summary
[none]
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.

References

Affected packages

Ubuntu:Pro:20.04:LTS / puma

Package

Name
puma
Purl
pkg:deb/ubuntu/puma?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.12.0-2ubuntu1
3.12.0-4ubuntu1
3.12.4-1ubuntu2
3.12.4-1ubuntu2+esm1
3.12.4-1ubuntu2+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.12.4-1ubuntu2+esm2",
            "binary_name": "puma"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47737.json"

Ubuntu:Pro:22.04:LTS / puma

Package

Name
puma
Purl
pkg:deb/ubuntu/puma?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.3.6-1ubuntu4
5.*
5.5.2-2ubuntu2
5.5.2-2ubuntu2+esm1
5.5.2-2ubuntu2+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "5.5.2-2ubuntu2+esm2",
            "binary_name": "puma"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47737.json"

Ubuntu:24.04:LTS / puma

Package

Name
puma
Purl
pkg:deb/ubuntu/puma?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.6.5-4ubuntu2
5.6.5-4ubuntu3
6.*
6.4.2-4ubuntu1
6.4.2-4ubuntu3
6.4.2-4ubuntu4
6.4.2-4ubuntu4.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "6.4.2-4ubuntu4.3",
            "binary_name": "puma"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47737.json"

Ubuntu:26.04:LTS / puma

Package

Name
puma
Purl
pkg:deb/ubuntu/puma?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

6.*
6.6.0-4
6.6.0-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "6.6.0-4build1",
            "binary_name": "puma"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47737.json"