UBUNTU-CVE-2026-6409

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Source
https://ubuntu.com/security/CVE-2026-6409
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6409.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-6409
Upstream
  • CVE-2026-6409
Published
2026-04-16T15:17:00Z
Modified
2026-05-26T21:30:06.588466540Z
Severity
  • 7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input. Maliciously structured messages—specifically those containing negative varints or deep recursion—can be used to crash the application, impacting service availability.

References

Affected packages

Ubuntu:22.04:LTS
protobuf

Package

Name
protobuf
Purl
pkg:deb/ubuntu/protobuf?arch=source&distro=jammy

Affected ranges

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

Affected versions

3.*
3.12.4-1ubuntu3
3.12.4-1ubuntu5
3.12.4-1ubuntu6
3.12.4-1ubuntu7
3.12.4-1ubuntu7.22.04.1
3.12.4-1ubuntu7.22.04.2
3.12.4-1ubuntu7.22.04.4
3.12.4-1ubuntu7.22.04.6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "elpa-protobuf-mode",
            "binary_version": "3.12.4-1ubuntu7.22.04.6"
        },
        {
            "binary_name": "libprotobuf-java",
            "binary_version": "3.12.4-1ubuntu7.22.04.6"
        },
        {
            "binary_name": "libprotobuf-lite23",
            "binary_version": "3.12.4-1ubuntu7.22.04.6"
        },
        {
            "binary_name": "libprotobuf23",
            "binary_version": "3.12.4-1ubuntu7.22.04.6"
        },
        {
            "binary_name": "libprotoc23",
            "binary_version": "3.12.4-1ubuntu7.22.04.6"
        },
        {
            "binary_name": "protobuf-compiler",
            "binary_version": "3.12.4-1ubuntu7.22.04.6"
        },
        {
            "binary_name": "python3-protobuf",
            "binary_version": "3.12.4-1ubuntu7.22.04.6"
        },
        {
            "binary_name": "ruby-google-protobuf",
            "binary_version": "3.12.4-1ubuntu7.22.04.6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6409.json"
Ubuntu:24.04:LTS
protobuf

Package

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

Affected ranges

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

Affected versions

3.*
3.21.12-7ubuntu1
3.21.12-8ubuntu1
3.21.12-8ubuntu5
3.21.12-8.2
3.21.12-8.2build1
3.21.12-8.2ubuntu0.1
3.21.12-8.2ubuntu0.2
3.21.12-8.2ubuntu0.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "elpa-protobuf-mode",
            "binary_version": "3.21.12-8.2ubuntu0.3"
        },
        {
            "binary_name": "libprotobuf-java",
            "binary_version": "3.21.12-8.2ubuntu0.3"
        },
        {
            "binary_name": "libprotobuf-lite32t64",
            "binary_version": "3.21.12-8.2ubuntu0.3"
        },
        {
            "binary_name": "libprotobuf32t64",
            "binary_version": "3.21.12-8.2ubuntu0.3"
        },
        {
            "binary_name": "libprotoc32t64",
            "binary_version": "3.21.12-8.2ubuntu0.3"
        },
        {
            "binary_name": "php-google-protobuf",
            "binary_version": "3.21.12-8.2ubuntu0.3"
        },
        {
            "binary_name": "protobuf-compiler",
            "binary_version": "3.21.12-8.2ubuntu0.3"
        },
        {
            "binary_name": "python3-protobuf",
            "binary_version": "3.21.12-8.2ubuntu0.3"
        },
        {
            "binary_name": "ruby-google-protobuf",
            "binary_version": "3.21.12-8.2ubuntu0.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6409.json"
Ubuntu:25.10
protobuf

Package

Name
protobuf
Purl
pkg:deb/ubuntu/protobuf?arch=source&distro=questing

Affected ranges

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

Affected versions

3.*
3.21.12-10build2
3.21.12-11
3.21.12-11ubuntu1
3.21.12-11ubuntu3
3.21.12-11ubuntu3.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "elpa-protobuf-mode",
            "binary_version": "3.21.12-11ubuntu3.1"
        },
        {
            "binary_name": "libprotobuf-java",
            "binary_version": "3.21.12-11ubuntu3.1"
        },
        {
            "binary_name": "libprotobuf-lite32t64",
            "binary_version": "3.21.12-11ubuntu3.1"
        },
        {
            "binary_name": "libprotobuf32t64",
            "binary_version": "3.21.12-11ubuntu3.1"
        },
        {
            "binary_name": "libprotoc32t64",
            "binary_version": "3.21.12-11ubuntu3.1"
        },
        {
            "binary_name": "php-google-protobuf",
            "binary_version": "3.21.12-11ubuntu3.1"
        },
        {
            "binary_name": "protobuf-compiler",
            "binary_version": "3.21.12-11ubuntu3.1"
        },
        {
            "binary_name": "python3-protobuf",
            "binary_version": "3.21.12-11ubuntu3.1"
        },
        {
            "binary_name": "ruby-google-protobuf",
            "binary_version": "3.21.12-11ubuntu3.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6409.json"
Ubuntu:26.04:LTS
protobuf

Package

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

Affected ranges

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

Affected versions

3.*
3.21.12-11ubuntu3
3.21.12-14
3.21.12-14build1
3.21.12-15
3.21.12-15ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "elpa-protobuf-mode",
            "binary_version": "3.21.12-15ubuntu1"
        },
        {
            "binary_name": "libprotobuf-java",
            "binary_version": "3.21.12-15ubuntu1"
        },
        {
            "binary_name": "libprotobuf-lite32t64",
            "binary_version": "3.21.12-15ubuntu1"
        },
        {
            "binary_name": "libprotobuf32t64",
            "binary_version": "3.21.12-15ubuntu1"
        },
        {
            "binary_name": "libprotoc32t64",
            "binary_version": "3.21.12-15ubuntu1"
        },
        {
            "binary_name": "php-google-protobuf",
            "binary_version": "3.21.12-15ubuntu1"
        },
        {
            "binary_name": "protobuf-compiler",
            "binary_version": "3.21.12-15ubuntu1"
        },
        {
            "binary_name": "python3-protobuf",
            "binary_version": "3.21.12-15ubuntu1"
        },
        {
            "binary_name": "ruby-google-protobuf",
            "binary_version": "3.21.12-15ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6409.json"
Ubuntu:Pro:14.04:LTS
protobuf

Package

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

Affected ranges

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

Affected versions

2.*
2.4.1-3ubuntu2
2.4.1-3ubuntu3
2.4.1-3ubuntu4
2.5.0-5ubuntu2
2.5.0-7ubuntu1
2.5.0-8ubuntu1
2.5.0-9ubuntu1
2.5.0-9ubuntu1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libprotobuf-java",
            "binary_version": "2.5.0-9ubuntu1+esm1"
        },
        {
            "binary_name": "libprotobuf-lite8",
            "binary_version": "2.5.0-9ubuntu1+esm1"
        },
        {
            "binary_name": "libprotobuf8",
            "binary_version": "2.5.0-9ubuntu1+esm1"
        },
        {
            "binary_name": "libprotoc8",
            "binary_version": "2.5.0-9ubuntu1+esm1"
        },
        {
            "binary_name": "protobuf-compiler",
            "binary_version": "2.5.0-9ubuntu1+esm1"
        },
        {
            "binary_name": "python-protobuf",
            "binary_version": "2.5.0-9ubuntu1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6409.json"
Ubuntu:Pro:16.04:LTS
protobuf

Package

Name
protobuf
Purl
pkg:deb/ubuntu/protobuf?arch=source&distro=esm-infra%2Fxenial

Affected ranges

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

Affected versions

2.*
2.6.1-1.2
2.6.1-1.3
2.6.1-1.3ubuntu0.1~esm1
2.6.1-1.3ubuntu0.1~esm2
2.6.1-1.3ubuntu0.1~esm4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libprotobuf-java",
            "binary_version": "2.6.1-1.3ubuntu0.1~esm4"
        },
        {
            "binary_name": "libprotobuf-lite9v5",
            "binary_version": "2.6.1-1.3ubuntu0.1~esm4"
        },
        {
            "binary_name": "libprotobuf9v5",
            "binary_version": "2.6.1-1.3ubuntu0.1~esm4"
        },
        {
            "binary_name": "libprotoc9v5",
            "binary_version": "2.6.1-1.3ubuntu0.1~esm4"
        },
        {
            "binary_name": "protobuf-compiler",
            "binary_version": "2.6.1-1.3ubuntu0.1~esm4"
        },
        {
            "binary_name": "python-protobuf",
            "binary_version": "2.6.1-1.3ubuntu0.1~esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6409.json"
Ubuntu:Pro:18.04:LTS
protobuf

Package

Name
protobuf
Purl
pkg:deb/ubuntu/protobuf?arch=source&distro=esm-infra%2Fbionic

Affected ranges

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

Affected versions

3.*
3.0.0-9ubuntu5
3.0.0-9ubuntu6
3.0.0-9.1ubuntu1
3.0.0-9.1ubuntu1.1
3.0.0-9.1ubuntu1.1+esm3
3.0.0-9.1ubuntu1.1+esm4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libprotobuf-java",
            "binary_version": "3.0.0-9.1ubuntu1.1+esm4"
        },
        {
            "binary_name": "libprotobuf-lite10",
            "binary_version": "3.0.0-9.1ubuntu1.1+esm4"
        },
        {
            "binary_name": "libprotobuf10",
            "binary_version": "3.0.0-9.1ubuntu1.1+esm4"
        },
        {
            "binary_name": "libprotoc10",
            "binary_version": "3.0.0-9.1ubuntu1.1+esm4"
        },
        {
            "binary_name": "protobuf-compiler",
            "binary_version": "3.0.0-9.1ubuntu1.1+esm4"
        },
        {
            "binary_name": "python-protobuf",
            "binary_version": "3.0.0-9.1ubuntu1.1+esm4"
        },
        {
            "binary_name": "python3-protobuf",
            "binary_version": "3.0.0-9.1ubuntu1.1+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6409.json"
Ubuntu:Pro:20.04:LTS
protobuf

Package

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

Affected ranges

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

Affected versions

3.*
3.6.1.3-2
3.6.1.3-2ubuntu1
3.6.1.3-2ubuntu3
3.6.1.3-2ubuntu4
3.6.1.3-2ubuntu5
3.6.1.3-2ubuntu5.2
3.6.1.3-2ubuntu5.2+esm2
3.6.1.3-2ubuntu5.2+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libprotobuf-java",
            "binary_version": "3.6.1.3-2ubuntu5.2+esm3"
        },
        {
            "binary_name": "libprotobuf-lite17",
            "binary_version": "3.6.1.3-2ubuntu5.2+esm3"
        },
        {
            "binary_name": "libprotobuf17",
            "binary_version": "3.6.1.3-2ubuntu5.2+esm3"
        },
        {
            "binary_name": "libprotoc17",
            "binary_version": "3.6.1.3-2ubuntu5.2+esm3"
        },
        {
            "binary_name": "protobuf-compiler",
            "binary_version": "3.6.1.3-2ubuntu5.2+esm3"
        },
        {
            "binary_name": "python-protobuf",
            "binary_version": "3.6.1.3-2ubuntu5.2+esm3"
        },
        {
            "binary_name": "python3-protobuf",
            "binary_version": "3.6.1.3-2ubuntu5.2+esm3"
        },
        {
            "binary_name": "ruby-google-protobuf",
            "binary_version": "3.6.1.3-2ubuntu5.2+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6409.json"