UBUNTU-CVE-2026-47736

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Source
https://ubuntu.com/security/CVE-2026-47736
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47736.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-47736
Upstream
Published
2026-07-14T20:17:00Z
Modified
2026-07-15T19:48:19.584763890Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 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, 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.

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-2026-47736.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-2026-47736.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-2026-47736.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-2026-47736.json"