UBUNTU-CVE-2025-61771

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Source
https://ubuntu.com/security/CVE-2025-61771
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-61771.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-61771
Upstream
Published
2025-10-07T15:16:00Z
Modified
2025-10-10T15:30:19Z
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

Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, `Rack::Multipart::Parser stores non-file form fields (parts without a filename) entirely in memory as Ruby String objects. A single large text field in a multipart/form-data request (hundreds of megabytes or more) can consume equivalent process memory, potentially leading to out-of-memory (OOM) conditions and denial of service (DoS). Attackers can send large non-file fields to trigger excessive memory usage. Impact scales with request size and concurrency, potentially leading to worker crashes or severe garbage-collection overhead. All Rack applications processing multipart form submissions are affected. Versions 2.2.19, 3.1.17, and 3.2.2 enforce a reasonable size cap for non-file fields (e.g., 2 MiB). Workarounds include restricting maximum request body size at the web-server or proxy layer (e.g., Nginx client_max_body_size) and validating and rejecting unusually large form fields at the application level.

References

Affected packages

Ubuntu:22.04:LTS

ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack@2.1.4-5ubuntu1.1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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
2.1.4-5ubuntu1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.1.4-5ubuntu1.1",
            "binary_name": "ruby-rack"
        }
    ]
}

Ubuntu:24.04:LTS

ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack@2.2.7-1ubuntu0.4?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.2.7-1ubuntu0.4",
            "binary_name": "ruby-rack"
        }
    ]
}

Ubuntu:25.04

ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack@2.2.7-1.1ubuntu0.25.04.3?arch=source&distro=plucky

Affected ranges

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

Affected versions

2.*

2.2.7-1.1
2.2.7-1.1ubuntu0.25.04.1
2.2.7-1.1ubuntu0.25.04.2
2.2.7-1.1ubuntu0.25.04.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.2.7-1.1ubuntu0.25.04.3",
            "binary_name": "ruby-rack"
        }
    ]
}

Ubuntu:25.10

ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack@3.1.16-0.1?arch=source&distro=questing

Affected ranges

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

Affected versions

2.*

2.2.7-1.1

3.*

3.1.16-0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.1.16-0.1",
            "binary_name": "ruby-rack"
        }
    ]
}

Ubuntu:Pro:14.04:LTS

ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack@1.5.2-3+deb8u3ubuntu1~esm10?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm10",
            "binary_name": "librack-ruby"
        },
        {
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm10",
            "binary_name": "librack-ruby1.8"
        },
        {
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm10",
            "binary_name": "librack-ruby1.9.1"
        },
        {
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm10",
            "binary_name": "ruby-rack"
        }
    ]
}

Ubuntu:Pro:16.04:LTS

ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack@1.6.4-3ubuntu0.2+esm8?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.6.4-3ubuntu0.2+esm8",
            "binary_name": "ruby-rack"
        }
    ]
}

Ubuntu:Pro:18.04:LTS

ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack@1.6.4-4ubuntu0.2+esm8?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.6.4-4ubuntu0.2+esm8",
            "binary_name": "ruby-rack"
        }
    ]
}

Ubuntu:Pro:20.04:LTS

ruby-rack

Package

Name
ruby-rack
Purl
pkg:deb/ubuntu/ruby-rack@2.0.7-2ubuntu0.1+esm7?arch=source&distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.0.7-2ubuntu0.1+esm7",
            "binary_name": "ruby-rack"
        }
    ]
}