usn-8025-1
Vulnerability from osv_ubuntu
Published
2026-02-11 14:25
Modified
2026-04-27 14:11
Summary
dotnet8, dotnet9, dotnet10 vulnerability
Details
Kevin Jones discovered that the System.Security.Cryptography.Cose component in .NET did not properly handle certain missing special elements in input data. An attacker could possibly use this issue to bypass security checks and gain unauthorized access or perform data manipulation.
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-21218",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
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},
{
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{
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{
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{
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},
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},
{
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{
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]
},
"package": {
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"name": "dotnet8",
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},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
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"8.0.103-8.0.3-0ubuntu1~22.04.1",
"8.0.103-8.0.3-0ubuntu1~22.04.2",
"8.0.105-8.0.5-0ubuntu1~22.04.1",
"8.0.107-8.0.7-0ubuntu1~22.04.1",
"8.0.108-8.0.8-0ubuntu1~22.04.1",
"8.0.110-8.0.10-0ubuntu1~22.04.1",
"8.0.111-8.0.11-0ubuntu1~22.04.1",
"8.0.112-8.0.12-0ubuntu1~22.04.1",
"8.0.114-8.0.14-0ubuntu1~22.04.1",
"8.0.115-8.0.15-0ubuntu1~22.04.1",
"8.0.116-8.0.16-0ubuntu1~22.04.1",
"8.0.117-8.0.17-0ubuntu1~22.04.1",
"8.0.118-8.0.18-0ubuntu1~22.04.1",
"8.0.119-8.0.19-0ubuntu1~22.04.1",
"8.0.120-8.0.20-0ubuntu1~22.04.1",
"8.0.121-8.0.21-0ubuntu1~22.04.1",
"8.0.122-8.0.22-0ubuntu1~22.04.1",
"8.0.123-8.0.23-0ubuntu1~22.04.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-21218",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:25.10"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "aspnetcore-runtime-10.0",
"binary_version": "10.0.3-0ubuntu1~25.10.1"
},
{
"binary_name": "aspnetcore-runtime-dbg-10.0",
"binary_version": "10.0.3-0ubuntu1~25.10.1"
},
{
"binary_name": "aspnetcore-targeting-pack-10.0",
"binary_version": "10.0.3-0ubuntu1~25.10.1"
},
{
"binary_name": "dotnet-apphost-pack-10.0",
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{
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{
"binary_name": "dotnet-sdk-10.0-source-built-artifacts",
"binary_version": "10.0.103-0ubuntu1~25.10.1"
},
{
"binary_name": "dotnet-sdk-aot-10.0",
"binary_version": "10.0.103-0ubuntu1~25.10.1"
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{
"binary_name": "dotnet-sdk-dbg-10.0",
"binary_version": "10.0.103-0ubuntu1~25.10.1"
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"binary_name": "dotnet-targeting-pack-10.0",
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},
{
"binary_name": "dotnet-templates-10.0",
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},
{
"binary_name": "dotnet10",
"binary_version": "10.0.103-10.0.3-0ubuntu1~25.10.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "dotnet10",
"purl": "pkg:deb/ubuntu/dotnet10@10.0.103-10.0.3-0ubuntu1~25.10.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "10.0.103-10.0.3-0ubuntu1~25.10.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"10.0.100-10.0.0~rc1-0ubuntu1",
"10.0.100-10.0.0~rc2-0ubuntu1~25.10.2",
"10.0.100-10.0.0-0ubuntu1~25.10.1",
"10.0.101-10.0.1-0ubuntu1~25.10.2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-21218",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:25.10"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "aspnetcore-runtime-8.0",
"binary_version": "8.0.24-0ubuntu1~25.10.1"
},
{
"binary_name": "aspnetcore-runtime-dbg-8.0",
"binary_version": "8.0.24-0ubuntu1~25.10.1"
},
{
"binary_name": "aspnetcore-targeting-pack-8.0",
"binary_version": "8.0.24-0ubuntu1~25.10.1"
},
{
"binary_name": "dotnet-apphost-pack-8.0",
"binary_version": "8.0.24-0ubuntu1~25.10.1"
},
{
"binary_name": "dotnet-host-8.0",
"binary_version": "8.0.24-0ubuntu1~25.10.1"
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{
"binary_name": "dotnet-hostfxr-8.0",
"binary_version": "8.0.24-0ubuntu1~25.10.1"
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{
"binary_name": "dotnet-runtime-8.0",
"binary_version": "8.0.24-0ubuntu1~25.10.1"
},
{
"binary_name": "dotnet-runtime-dbg-8.0",
"binary_version": "8.0.24-0ubuntu1~25.10.1"
},
{
"binary_name": "dotnet-sdk-8.0",
"binary_version": "8.0.124-0ubuntu1~25.10.1"
},
{
"binary_name": "dotnet-sdk-8.0-source-built-artifacts",
"binary_version": "8.0.124-0ubuntu1~25.10.1"
},
{
"binary_name": "dotnet-sdk-dbg-8.0",
"binary_version": "8.0.124-0ubuntu1~25.10.1"
},
{
"binary_name": "dotnet-targeting-pack-8.0",
"binary_version": "8.0.24-0ubuntu1~25.10.1"
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{
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{
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{
"binary_name": "netstandard-targeting-pack-2.1-8.0",
"binary_version": "8.0.124-0ubuntu1~25.10.1"
}
]
},
"package": {
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"name": "dotnet8",
"purl": "pkg:deb/ubuntu/dotnet8@8.0.124-8.0.24-0ubuntu1~25.10.1?arch=source\u0026distro=questing"
},
"ranges": [
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"events": [
{
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{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
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"8.0.116-8.0.16-0ubuntu1",
"8.0.117-8.0.17-0ubuntu1",
"8.0.118-8.0.18-0ubuntu1",
"8.0.119-8.0.19-0ubuntu1",
"8.0.120-8.0.20-0ubuntu1",
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"8.0.122-8.0.22-0ubuntu1~25.10.1",
"8.0.123-8.0.23-0ubuntu1~25.10.1"
]
},
{
"database_specific": {
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{
"id": "CVE-2026-21218",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:25.10"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
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"binary_version": "9.0.13-0ubuntu1~25.10.1"
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{
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{
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{
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{
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{
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"binary_version": "9.0.13-0ubuntu1~25.10.1"
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{
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"binary_version": "9.0.13-0ubuntu1~25.10.1"
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{
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"binary_version": "9.0.13-0ubuntu1~25.10.1"
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{
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"binary_version": "9.0.114-0ubuntu1~25.10.1"
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{
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"binary_version": "9.0.114-0ubuntu1~25.10.1"
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{
"binary_name": "dotnet9",
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},
{
"binary_name": "netstandard-targeting-pack-2.1-9.0",
"binary_version": "9.0.114-0ubuntu1~25.10.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "dotnet9",
"purl": "pkg:deb/ubuntu/dotnet9@9.0.114-9.0.13-0ubuntu1~25.10.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.114-9.0.13-0ubuntu1~25.10.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"9.0.105-9.0.4-0ubuntu1",
"9.0.106-9.0.5-0ubuntu1",
"9.0.107-9.0.6-0ubuntu1",
"9.0.108-9.0.7-0ubuntu1",
"9.0.109-9.0.8-0ubuntu1",
"9.0.110-9.0.9-0ubuntu1",
"9.0.111-9.0.10-0ubuntu1~25.10.1",
"9.0.112-9.0.11-0ubuntu1~25.10.1",
"9.0.113-9.0.12-0ubuntu1~25.10.1"
]
}
],
"aliases": [],
"details": "Kevin Jones discovered that the System.Security.Cryptography.Cose component\nin .NET did not properly handle certain missing special elements in input\ndata. An attacker could possibly use this issue to bypass security checks\nand gain unauthorized access or perform data manipulation.",
"id": "USN-8025-1",
"modified": "2026-04-27T14:11:47Z",
"published": "2026-02-11T14:25:40Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8025-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-21218"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "dotnet8, dotnet9, dotnet10 vulnerability",
"upstream": [
"UBUNTU-CVE-2026-21218"
]
}
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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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