USN-8063-2 (UBUNTU-CVE-2026-0994)
Vulnerability from osv_ubuntu – Published: 2026-05-26 20:31 – Updated: 2026-06-30 15:54 – Source website
VLAI
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
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-0994",
"severity": [
{
"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_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "protobuf",
"purl": "pkg:deb/ubuntu/protobuf@3.0.0-9.1ubuntu1.1+esm4?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.0.0-9.1ubuntu1.1+esm4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-0994",
"severity": [
{
"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_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "protobuf",
"purl": "pkg:deb/ubuntu/protobuf@3.6.1.3-2ubuntu5.2+esm3?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.1.3-2ubuntu5.2+esm3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
]
}
],
"aliases": [],
"details": "USN-8063-1 fixed a vulnerability in Protocol Buffers. This update provides\nthe corresponding update for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.\n\nOriginal advisory details:\n\n It was discovered that Protocol Buffers incorrectly handled recursion\n when the Python google.protobuf.json_format.ParseDict() function is being\n used. An attacker could possibly use this issue to cause Protocol Buffers\n to consume resources, resulting in a denial of service.",
"id": "USN-8063-2",
"modified": "2026-06-30T15:54:50Z",
"published": "2026-05-26T20:31:47Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8063-2"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-0994"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "protobuf vulnerability",
"upstream": [
"UBUNTU-CVE-2026-0994"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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