USN-8063-2

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Source
https://ubuntu.com/security/notices/USN-8063-2
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8063-2.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8063-2
Upstream
Related
Published
2026-05-26T20:31:47Z
Modified
2026-05-26T22:59:14.119783231Z
Summary
protobuf vulnerability
Details

USN-8063-1 fixed a vulnerability in Protocol Buffers. This update provides the corresponding update for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.

Original advisory details:

It was discovered that Protocol Buffers incorrectly handled recursion when the Python google.protobuf.json_format.ParseDict() function is being used. An attacker could possibly use this issue to cause Protocol Buffers to consume resources, resulting in a denial of service.

References

Affected packages

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
Fixed
3.0.0-9.1ubuntu1.1+esm4

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

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "3.0.0-9.1ubuntu1.1+esm4",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8063-2.json"
cves_map 
{
    "ecosystem": "Ubuntu:Pro:18.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-0994",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}

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
Fixed
3.6.1.3-2ubuntu5.2+esm3

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

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "3.6.1.3-2ubuntu5.2+esm3",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8063-2.json"
cves_map 
{
    "ecosystem": "Ubuntu:Pro:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-0994",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}