UBUNTU-CVE-2026-34829

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Source

https://ubuntu.com/security/CVE-2026-34829

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34829.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-34829

Upstream

CVE-2026-34829

Downstream

USN-8182-1

Related

USN-8182-1

Published

2026-04-02T17:16:00Z

Modified

2026-04-21T14:16:54.035554Z

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. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Multipart::Parser only wraps the request body in a BoundedIO when CONTENT_LENGTH is present. When a multipart/form-data request is sent without a Content-Length header, such as with HTTP chunked transfer encoding, multipart parsing continues until end-of-stream with no total size limit. For file parts, the uploaded body is written directly to a temporary file on disk rather than being constrained by the buffered in-memory upload limit. An unauthenticated attacker can therefore stream an arbitrarily large multipart file upload and consume unbounded disk space. This results in a denial of service condition for Rack applications that accept multipart form data. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.

References

Affected packages

Ubuntu:24.04:LTS

ruby-rack

Package

Name: ruby-rack
Purl: pkg:deb/ubuntu/ruby-rack@2.2.7-1ubuntu0.7?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.2.7-1ubuntu0.7

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

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "2.2.7-1ubuntu0.7",
            "binary_name": "ruby-rack"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34829.json"

Ubuntu:25.10

ruby-rack

Package

Name: ruby-rack
Purl: pkg:deb/ubuntu/ruby-rack@3.1.16-0.1ubuntu0.3?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

3.1.16-0.1ubuntu0.3

Affected versions

2.*

2.2.7-1.1

3.*

3.1.16-0.1

3.1.16-0.1ubuntu0.1

3.1.16-0.1ubuntu0.2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.1.16-0.1ubuntu0.3",
            "binary_name": "ruby-rack"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34829.json"

Ubuntu:Pro:14.04:LTS

ruby-rack

Package

Name: ruby-rack
Purl: pkg:deb/ubuntu/ruby-rack@1.5.2-3+deb8u3ubuntu1~esm11?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

1.5.2-3+deb8u3ubuntu1~esm11

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm11",
            "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"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34829.json"

Ubuntu:Pro:16.04:LTS

ruby-rack

Package

Name: ruby-rack
Purl: pkg:deb/ubuntu/ruby-rack@1.6.4-3ubuntu0.2+esm10?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

1.6.4-3ubuntu0.2+esm9

1.6.4-3ubuntu0.2+esm10

Ecosystem specific

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

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34829.json"

Ubuntu:Pro:18.04:LTS

ruby-rack

Package

Name: ruby-rack
Purl: pkg:deb/ubuntu/ruby-rack@1.6.4-4ubuntu0.2+esm10?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

1.6.4-4ubuntu0.2+esm9

1.6.4-4ubuntu0.2+esm10

Ecosystem specific

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

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34829.json"

Ubuntu:Pro:20.04:LTS

ruby-rack

Package

Name: ruby-rack
Purl: pkg:deb/ubuntu/ruby-rack@2.0.7-2ubuntu0.1+esm10?arch=source&distro=esm-apps/focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.0.7-2ubuntu0.1+esm10

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

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "2.0.7-2ubuntu0.1+esm10",
            "binary_name": "ruby-rack"
        }
    ],
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34829.json"

Ubuntu:Pro:22.04:LTS

ruby-rack

Package

Name: ruby-rack
Purl: pkg:deb/ubuntu/ruby-rack@2.1.4-5ubuntu1.2+esm3?arch=source&distro=esm-apps/jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.1.4-5ubuntu1.2+esm3

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

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "2.1.4-5ubuntu1.2+esm3",
            "binary_name": "ruby-rack"
        }
    ],
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34829.json"