UBUNTU-CVE-2026-125111

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Source
https://ubuntu.com/security/CVE-2026-125111
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125111.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-125111
Upstream
Published
2026-11-12T00:00:00Z
Modified
2026-11-12T23:46:36Z
Severity
  • Ubuntu - medium
Summary
[none]
Details

Rack is a modular Ruby web server interface. Prior to 2.2.25, 3.1.23, and 3.2.8, Rack::Multipart::Parser can retain parsed data in its internal StringScanner buffer when reads end inside or immediately after multipart headers. An unauthenticated attacker can align many small parts with rack.multipart.buffer_size boundaries so the buffer grows with the request despite per-field, header, and preamble limits, causing a worker to exhaust memory. The attack requires only a well-formed multipart body and affects applications that parse multipart requests. This issue is fixed in versions 2.2.25, 3.1.23, and 3.2.8.

References

Affected packages

Ubuntu:24.04:LTS
ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*
2.2.4-3
2.2.7-1
2.2.7-1ubuntu0.1
2.2.7-1ubuntu0.2
2.2.7-1ubuntu0.3
2.2.7-1ubuntu0.4
2.2.7-1ubuntu0.5
2.2.7-1ubuntu0.6
2.2.7-1ubuntu0.7

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-rack",
            "binary_version": "2.2.7-1ubuntu0.7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125111.json"
Ubuntu:26.04:LTS
ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack?arch=source&distro=resolute

Affected ranges

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

Affected versions

3.*
3.1.16-0.1
3.1.18-1
3.1.18-1build1
3.2.4-1ubuntu1
3.2.4-1ubuntu1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-rack",
            "binary_version": "3.2.4-1ubuntu1.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125111.json"
Ubuntu:26.10
ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack?arch=source&distro=stonking

Affected ranges

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

Affected versions

3.*
3.2.4-1ubuntu1
3.2.6-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-rack",
            "binary_version": "3.2.6-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125111.json"
Ubuntu:Pro:14.04:LTS
ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

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

Affected versions

1.*
1.5.2-1
1.5.2-1ubuntu0.1~esm1
1.5.2-3+deb8u3ubuntu1~esm2
1.5.2-3+deb8u3ubuntu1~esm3
1.5.2-3+deb8u3ubuntu1~esm4
1.5.2-3+deb8u3ubuntu1~esm6
1.5.2-3+deb8u3ubuntu1~esm7
1.5.2-3+deb8u3ubuntu1~esm8
1.5.2-3+deb8u3ubuntu1~esm9
1.5.2-3+deb8u3ubuntu1~esm10
1.5.2-3+deb8u3ubuntu1~esm11

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "librack-ruby",
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm11"
        },
        {
            "binary_name": "librack-ruby1.8",
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm11"
        },
        {
            "binary_name": "librack-ruby1.9.1",
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm11"
        },
        {
            "binary_name": "ruby-rack",
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm11"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125111.json"
Ubuntu:Pro:16.04:LTS
ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack?arch=source&distro=esm-apps%2Fxenial

Affected ranges

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

Affected versions

1.*
1.5.2-4
1.6.4-2
1.6.4-3
1.6.4-3ubuntu0.1
1.6.4-3ubuntu0.2
1.6.4-3ubuntu0.2+esm1
1.6.4-3ubuntu0.2+esm2
1.6.4-3ubuntu0.2+esm4
1.6.4-3ubuntu0.2+esm5
1.6.4-3ubuntu0.2+esm6
1.6.4-3ubuntu0.2+esm7
1.6.4-3ubuntu0.2+esm8
1.6.4-3ubuntu0.2+esm9
1.6.4-3ubuntu0.2+esm10

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-rack",
            "binary_version": "1.6.4-3ubuntu0.2+esm10"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125111.json"
Ubuntu:Pro:18.04:LTS
ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack?arch=source&distro=esm-apps%2Fbionic

Affected ranges

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

Affected versions

1.*
1.6.4-4
1.6.4-4ubuntu0.1
1.6.4-4ubuntu0.2
1.6.4-4ubuntu0.2+esm1
1.6.4-4ubuntu0.2+esm2
1.6.4-4ubuntu0.2+esm4
1.6.4-4ubuntu0.2+esm5
1.6.4-4ubuntu0.2+esm6
1.6.4-4ubuntu0.2+esm7
1.6.4-4ubuntu0.2+esm8
1.6.4-4ubuntu0.2+esm9
1.6.4-4ubuntu0.2+esm10

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-rack",
            "binary_version": "1.6.4-4ubuntu0.2+esm10"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125111.json"
Ubuntu:Pro:20.04:LTS
ruby-rack

Package

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

Affected ranges

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

Affected versions

2.*
2.0.6-3
2.0.7-2
2.0.7-2ubuntu0.1
2.0.7-2ubuntu0.1+esm1
2.0.7-2ubuntu0.1+esm2
2.0.7-2ubuntu0.1+esm3
2.0.7-2ubuntu0.1+esm4
2.0.7-2ubuntu0.1+esm5
2.0.7-2ubuntu0.1+esm6
2.0.7-2ubuntu0.1+esm7
2.0.7-2ubuntu0.1+esm8
2.0.7-2ubuntu0.1+esm9
2.0.7-2ubuntu0.1+esm10

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-rack",
            "binary_version": "2.0.7-2ubuntu0.1+esm10"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125111.json"
Ubuntu:Pro:22.04:LTS
ruby-rack

Package

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

Affected ranges

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

Affected versions

2.*
2.1.4-3
2.1.4-4
2.1.4-5
2.1.4-5ubuntu1
2.1.4-5ubuntu1+esm2
2.1.4-5ubuntu1+esm3
2.1.4-5ubuntu1+esm4
2.1.4-5ubuntu1+esm5
2.1.4-5ubuntu1.1
2.1.4-5ubuntu1.1+esm1
2.1.4-5ubuntu1.1+esm2
2.1.4-5ubuntu1.2
2.1.4-5ubuntu1.2+esm1
2.1.4-5ubuntu1.2+esm2
2.1.4-5ubuntu1.2+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-rack",
            "binary_version": "2.1.4-5ubuntu1.2+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125111.json"