CVE-2026-23666 (GCVE-0-2026-23666)
Vulnerability from cvelistv5 – Published: 2026-04-14 16:57 – Updated: 2026-10-15 15:53
VLAI
EPSS
VEX
Title
.NET Framework Denial of Service Vulnerability
Summary
Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-15 13:40 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
| https://access.redhat.com/security/cve/CVE-2026-23666 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2458271 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
Impacted products
10 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Microsoft | Microsoft .NET Framework 3.5 |
Affected:
3.5.0 , < 2.0.50727.8982 & 3.0.30729.8976
(custom)
|
guessed | |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.2 |
Affected:
4.7.0 , < 2.0.50727.9068 & 3.0.30729.9065 & 4.7.4141.0
(custom)
|
guessed | |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 |
Affected:
4.8.0 , < 2.0.50727.9068 & 3.0.30729.9065 & 4.8.4801.0
(custom)
|
guessed | |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 |
Affected:
4.8.1 , < 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0
(custom)
|
guessed | |
| Microsoft | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 |
Affected:
4.7.0 , < 4.8.4801.0
(custom)
|
guessed | |
| Microsoft | Microsoft .NET Framework 4.8 |
Affected:
4.8.0 , < 4.8.4801.0
(custom)
|
guessed | |
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
||
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
||
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
||
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1
|
Date Public
2026-04-14 14:00
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-23666",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-15T13:40:59.739058Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-15T13:41:08.655Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"affected": [
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:10"
],
"defaultStatus": "unaffected",
"packageName": "dotnet10.0",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:10"
],
"defaultStatus": "unaffected",
"packageName": "dotnet8.0",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:10"
],
"defaultStatus": "unaffected",
"packageName": "dotnet9.0",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:8"
],
"defaultStatus": "unaffected",
"packageName": "dotnet10.0",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:8"
],
"defaultStatus": "unaffected",
"packageName": "dotnet8.0",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:8"
],
"defaultStatus": "unaffected",
"packageName": "dotnet9.0",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9"
],
"defaultStatus": "unaffected",
"packageName": "dotnet10.0",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9"
],
"defaultStatus": "unaffected",
"packageName": "dotnet8.0",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9"
],
"defaultStatus": "unaffected",
"packageName": "dotnet9.0",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"defaultStatus": "unaffected",
"packageName": "dotnet10.0",
"product": "Red Hat Hardened Images",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"defaultStatus": "unaffected",
"packageName": "dotnet8.0",
"product": "Red Hat Hardened Images",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"defaultStatus": "unaffected",
"packageName": "dotnet9.0",
"product": "Red Hat Hardened Images",
"vendor": "Red Hat"
}
],
"datePublic": "2026-04-14T16:57:53.069Z",
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in .NET Framework. An unauthorized attacker can exploit a race condition, which is a concurrent execution using shared resources with improper synchronization, to deny service over a network. This vulnerability can lead to a Denial of Service (DoS) for affected systems."
}
],
"metrics": [
{
"other": {
"content": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"value": "Important"
},
"type": "Red Hat severity rating"
}
},
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-366",
"description": "Race Condition within a Thread",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-15T01:18:11.295Z",
"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"shortName": "redhat-SADP"
},
"references": [
{
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/security/cve/CVE-2026-23666"
},
{
"name": "RHBZ#2458271",
"tags": [
"issue-tracking",
"x_refsource_REDHAT"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458271"
},
{
"tags": [
"x_sadp-csaf-vex"
],
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23666.json"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-04-14T18:01:54.434Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-04-14T16:57:53.069Z",
"value": "Made public."
}
],
"title": "dotnet: .NET Framework: Denial of Service via Race Condition",
"x_adpType": "supplier",
"x_generator": {
"engine": "sadp-cli 1.0.0"
}
}
],
"cna": {
"affected": [
{
"platforms": [
"Windows Server 2012",
"Windows Server 2012 (Server Core installation)",
"Windows Server 2012 R2",
"Windows Server 2012 R2 (Server Core installation)"
],
"product": "Microsoft .NET Framework 3.5",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.8982 \u0026 3.0.30729.8976",
"status": "affected",
"version": "3.5.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems"
],
"product": "Microsoft .NET Framework 3.5 AND 4.7.2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.7.4141.0",
"status": "affected",
"version": "4.7.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems",
"Windows 10 Version 21H2 for 32-bit Systems",
"Windows 10 Version 21H2 for ARM64-based Systems",
"Windows 10 Version 21H2 for x64-based Systems",
"Windows 10 Version 22H2 for 32-bit Systems",
"Windows 10 Version 22H2 for ARM64-based Systems",
"Windows 10 Version 22H2 for x64-based Systems",
"Windows Server 2022",
"Windows Server 2022 (Server Core installation)"
],
"product": "Microsoft .NET Framework 3.5 AND 4.8",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.8.4801.0",
"status": "affected",
"version": "4.8.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 21H2 for 32-bit Systems",
"Windows 10 Version 21H2 for ARM64-based Systems",
"Windows 10 Version 21H2 for x64-based Systems",
"Windows 10 Version 22H2 for 32-bit Systems",
"Windows 10 Version 22H2 for ARM64-based Systems",
"Windows 10 Version 22H2 for x64-based Systems",
"Windows 11 Version 22H2 for ARM64-based Systems",
"Windows 11 Version 22H2 for x64-based Systems",
"Windows 11 Version 23H2 for ARM64-based Systems",
"Windows 11 Version 23H2 for x64-based Systems",
"Windows 11 Version 24H2 for ARM64-based Systems",
"Windows 11 Version 24H2 for x64-based Systems",
"Windows 11 Version 25H2 for ARM64-based Systems",
"Windows 11 Version 25H2 for x64-based Systems",
"Windows 11 Version 26H1 for ARM64-based Systems",
"Windows 11 version 26H1 for x64-based Systems",
"Windows Server 2022",
"Windows Server 2022 (Server Core installation)",
"Windows Server 2022, 23H2 Edition (Server Core installation)",
"Windows Server 2025",
"Windows Server 2025 (Server Core installation)"
],
"product": "Microsoft .NET Framework 3.5 AND 4.8.1",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.9181 \u0026 3.0.30729.9165 \u0026 4.8.9332.0",
"status": "affected",
"version": "4.8.1",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows Server 2012",
"Windows Server 2012 (Server Core installation)",
"Windows Server 2012 R2",
"Windows Server 2012 R2 (Server Core installation)"
],
"product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "4.8.4801.0",
"status": "affected",
"version": "4.7.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 1607 for 32-bit Systems",
"Windows 10 Version 1607 for x64-based Systems",
"Windows Server 2012",
"Windows Server 2012 (Server Core installation)",
"Windows Server 2012 R2",
"Windows Server 2012 R2 (Server Core installation)"
],
"product": "Microsoft .NET Framework 4.8",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "4.8.4801.0",
"status": "affected",
"version": "4.8.0",
"versionType": "custom"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.8.4801.0",
"versionStartIncluding": "4.8.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.8.4801.0",
"versionStartIncluding": "4.8.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.7.4141.0",
"versionStartIncluding": "4.7.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.8.4801.0",
"versionStartIncluding": "4.7.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.0.50727.9181 \u0026 3.0.30729.9165 \u0026 4.8.9332.0",
"versionStartIncluding": "4.8.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.0.50727.8982 \u0026 3.0.30729.8976",
"versionStartIncluding": "3.5.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"datePublic": "2026-04-14T14:00:00.000Z",
"descriptions": [
{
"lang": "en-US",
"value": "Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en-US",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-755",
"description": "CWE-755: Improper Handling of Exceptional Conditions",
"lang": "en-US",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-15T15:53:06.154Z",
"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"shortName": "microsoft"
},
"references": [
{
"name": ".NET Framework Denial of Service Vulnerability",
"tags": [
"vendor-advisory",
"patch"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666"
}
],
"title": ".NET Framework Denial of Service Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"assignerShortName": "microsoft",
"cveId": "CVE-2026-23666",
"datePublished": "2026-04-14T16:57:53.069Z",
"dateReserved": "2026-01-14T16:59:33.464Z",
"dateUpdated": "2026-10-15T15:53:06.154Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-23666",
"date": "2026-10-21",
"epss": "0.0133",
"percentile": "0.70783"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"platforms": [
"Windows Server 2012",
"Windows Server 2012 (Server Core installation)",
"Windows Server 2012 R2",
"Windows Server 2012 R2 (Server Core installation)"
],
"product": "Microsoft .NET Framework 3.5",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.8982 \u0026 3.0.30729.8976",
"status": "affected",
"version": "3.5.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems"
],
"product": "Microsoft .NET Framework 3.5 AND 4.7.2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.7.4141.0",
"status": "affected",
"version": "4.7.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems",
"Windows 10 Version 21H2 for 32-bit Systems",
"Windows 10 Version 21H2 for ARM64-based Systems",
"Windows 10 Version 21H2 for x64-based Systems",
"Windows 10 Version 22H2 for 32-bit Systems",
"Windows 10 Version 22H2 for ARM64-based Systems",
"Windows 10 Version 22H2 for x64-based Systems",
"Windows Server 2022",
"Windows Server 2022 (Server Core installation)"
],
"product": "Microsoft .NET Framework 3.5 AND 4.8",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.8.4801.0",
"status": "affected",
"version": "4.8.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 21H2 for 32-bit Systems",
"Windows 10 Version 21H2 for ARM64-based Systems",
"Windows 10 Version 21H2 for x64-based Systems",
"Windows 10 Version 22H2 for 32-bit Systems",
"Windows 10 Version 22H2 for ARM64-based Systems",
"Windows 10 Version 22H2 for x64-based Systems",
"Windows 11 Version 22H2 for ARM64-based Systems",
"Windows 11 Version 22H2 for x64-based Systems",
"Windows 11 Version 23H2 for ARM64-based Systems",
"Windows 11 Version 23H2 for x64-based Systems",
"Windows 11 Version 24H2 for ARM64-based Systems",
"Windows 11 Version 24H2 for x64-based Systems",
"Windows 11 Version 25H2 for ARM64-based Systems",
"Windows 11 Version 25H2 for x64-based Systems",
"Windows 11 Version 26H1 for ARM64-based Systems",
"Windows 11 version 26H1 for x64-based Systems",
"Windows Server 2022",
"Windows Server 2022 (Server Core installation)",
"Windows Server 2022, 23H2 Edition (Server Core installation)",
"Windows Server 2025",
"Windows Server 2025 (Server Core installation)"
],
"product": "Microsoft .NET Framework 3.5 AND 4.8.1",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.9181 \u0026 3.0.30729.9165 \u0026 4.8.9332.0",
"status": "affected",
"version": "4.8.1",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows Server 2012",
"Windows Server 2012 (Server Core installation)",
"Windows Server 2012 R2",
"Windows Server 2012 R2 (Server Core installation)"
],
"product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "4.8.4801.0",
"status": "affected",
"version": "4.7.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 1607 for 32-bit Systems",
"Windows 10 Version 1607 for x64-based Systems",
"Windows Server 2012",
"Windows Server 2012 (Server Core installation)",
"Windows Server 2012 R2",
"Windows Server 2012 R2 (Server Core installation)"
],
"product": "Microsoft .NET Framework 4.8",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "4.8.4801.0",
"status": "affected",
"version": "4.8.0",
"versionType": "custom"
}
]
}
],
"source": "secure@microsoft.com"
},
{
"affectedData": [
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:10"
],
"defaultStatus": "unaffected",
"packageName": "dotnet10.0",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:10"
],
"defaultStatus": "unaffected",
"packageName": "dotnet8.0",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:10"
],
"defaultStatus": "unaffected",
"packageName": "dotnet9.0",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:8"
],
"defaultStatus": "unaffected",
"packageName": "dotnet10.0",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:8"
],
"defaultStatus": "unaffected",
"packageName": "dotnet8.0",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:8"
],
"defaultStatus": "unaffected",
"packageName": "dotnet9.0",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9"
],
"defaultStatus": "unaffected",
"packageName": "dotnet10.0",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9"
],
"defaultStatus": "unaffected",
"packageName": "dotnet8.0",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9"
],
"defaultStatus": "unaffected",
"packageName": "dotnet9.0",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"defaultStatus": "unaffected",
"packageName": "dotnet10.0",
"product": "Red Hat Hardened Images",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"defaultStatus": "unaffected",
"packageName": "dotnet8.0",
"product": "Red Hat Hardened Images",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"defaultStatus": "unaffected",
"packageName": "dotnet9.0",
"product": "Red Hat Hardened Images",
"vendor": "Red Hat"
}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*",
"matchCriteriaId": "23317443-1968-4791-9F20-AD3B308A83D1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*",
"matchCriteriaId": "A7DF96F8-BA6A-4780-9CA3-F719B3F81074",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*",
"matchCriteriaId": "DB18C4CE-5917-401E-ACF7-2747084FD36E",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*",
"matchCriteriaId": "23317443-1968-4791-9F20-AD3B308A83D1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net_framework:4.7.2:*:*:*:*:*:*:*",
"matchCriteriaId": "3EF7A75E-EE27-4AA7-8D84-9D696728A4CE",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:arm64:*",
"matchCriteriaId": "73D24713-D897-408D-893B-77A61982597D",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "306B7CE6-8239-4AED-9ED4-4C9F5B349F58",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x86:*",
"matchCriteriaId": "345FCD64-D37B-425B-B64C-8B1640B7E850",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*",
"matchCriteriaId": "23317443-1968-4791-9F20-AD3B308A83D1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:*",
"matchCriteriaId": "2D3F18AF-84ED-473B-A8DF-65EB23C475AF",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:arm64:*",
"matchCriteriaId": "73D24713-D897-408D-893B-77A61982597D",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "306B7CE6-8239-4AED-9ED4-4C9F5B349F58",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x86:*",
"matchCriteriaId": "345FCD64-D37B-425B-B64C-8B1640B7E850",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:arm64:*",
"matchCriteriaId": "8FC46499-DB6E-48BF-9334-85EE27AFE7AF",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "83A79DD6-E74E-419F-93F1-323B68502633",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:x86:*",
"matchCriteriaId": "61959ACC-B608-4556-92AF-4D94B338907A",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:arm64:*",
"matchCriteriaId": "A9D54EE6-30AF-411C-A285-A4DCB6C6EC06",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "C230D3BF-7FCE-405C-B62E-B9190C995C3C",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:x86:*",
"matchCriteriaId": "1FD62DCB-66D1-4CEA-828E-0BD302AC63CA",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*",
"matchCriteriaId": "821614DD-37DD-44E2-A8A4-FE8D23A33C3C",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*",
"matchCriteriaId": "23317443-1968-4791-9F20-AD3B308A83D1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net_framework:4.8.1:*:*:*:*:*:*:*",
"matchCriteriaId": "934D4E46-12C1-41DC-A28C-A2C430E965E4",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:arm64:*",
"matchCriteriaId": "8FC46499-DB6E-48BF-9334-85EE27AFE7AF",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "83A79DD6-E74E-419F-93F1-323B68502633",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:x86:*",
"matchCriteriaId": "61959ACC-B608-4556-92AF-4D94B338907A",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:arm64:*",
"matchCriteriaId": "A9D54EE6-30AF-411C-A285-A4DCB6C6EC06",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "C230D3BF-7FCE-405C-B62E-B9190C995C3C",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:x86:*",
"matchCriteriaId": "1FD62DCB-66D1-4CEA-828E-0BD302AC63CA",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_22h2:-:*:*:*:*:*:arm64:*",
"matchCriteriaId": "B2D24C54-F04F-4717-B614-FE67B3ED9DC0",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_22h2:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "D5EC3F68-8F41-4F6B-B2E5-920322A4A321",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_23h2:-:*:*:*:*:*:arm64:*",
"matchCriteriaId": "B0301BA0-81DB-4FC1-9BC3-EB48A56BC608",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_23h2:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "8E3C1327-F331-4448-A253-00EAC7428317",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_24h2:-:*:*:*:*:*:arm64:*",
"matchCriteriaId": "08EE1F3A-A8DE-4867-BB5B-8A8ED867F3CA",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_24h2:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "B1670829-6A8C-4688-B7A5-3DFB878A4861",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_25h2:-:*:*:*:*:*:arm64:*",
"matchCriteriaId": "024EE6EC-6D62-4EAC-B1EF-A5E4EAD439A1",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_25h2:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "25D142AB-B61D-43F3-B7E6-DB9140EFEF75",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_26h1:-:*:*:*:*:*:arm64:*",
"matchCriteriaId": "CBFE0371-0C4D-406A-9EC7-456104271C3E",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_11_26h1:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "F2B83840-FCE8-445A-AE55-ACEDA6534FA1",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*",
"matchCriteriaId": "821614DD-37DD-44E2-A8A4-FE8D23A33C3C",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2022_23h2:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "FBF3E8E3-BC4A-4CBA-8859-0AB6393E8A40",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2025:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "FE97605F-7942-435A-9F5B-D51FA19A41AD",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:.net_framework:4.6.2:*:*:*:*:*:*:*",
"matchCriteriaId": "A16AD2B0-2189-4E8E-B7FC-CE598CA1CB2D",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net_framework:4.7:*:*:*:*:*:*:*",
"matchCriteriaId": "734112B3-1383-4BE3-8721-C0F84566B764",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net_framework:4.7.1:*:*:*:*:*:*:*",
"matchCriteriaId": "36B0E40A-84EF-4099-A395-75D6B8CDA196",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net_framework:4.7.2:*:*:*:*:*:*:*",
"matchCriteriaId": "3EF7A75E-EE27-4AA7-8D84-9D696728A4CE",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*",
"matchCriteriaId": "A7DF96F8-BA6A-4780-9CA3-F719B3F81074",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*",
"matchCriteriaId": "DB18C4CE-5917-401E-ACF7-2747084FD36E",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:*",
"matchCriteriaId": "2D3F18AF-84ED-473B-A8DF-65EB23C475AF",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "5E491E46-1917-41FE-8F9A-BB0BDDEB42C3",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x86:*",
"matchCriteriaId": "0A1BC97A-263E-4291-8AEF-02EE4E6031E9",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*",
"matchCriteriaId": "A7DF96F8-BA6A-4780-9CA3-F719B3F81074",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*",
"matchCriteriaId": "DB18C4CE-5917-401E-ACF7-2747084FD36E",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network."
}
],
"id": "CVE-2026-23666",
"lastModified": "2026-07-15T02:18:43.713",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "secure@microsoft.com",
"type": "Secondary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-23666",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-15T13:40:59.739058Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-04-14T18:16:44.507",
"references": [
{
"source": "secure@microsoft.com",
"tags": [
"Vendor Advisory"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/security/cve/CVE-2026-23666"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458271"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23666.json"
}
],
"sourceIdentifier": "secure@microsoft.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-755"
}
],
"source": "secure@microsoft.com",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-366"
}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-06-30T04:15:44+00:00",
"cve": "CVE-2026-23666",
"id": "CVE-2026-23666",
"initial_release_date": "2026-04-14T16:57:53.069000+00:00",
"product_status:known_not_affected": "133",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "dotnet: .NET Framework: Denial of Service via Race Condition",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23666.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"affected": [
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:10"
],
"defaultStatus": "unaffected",
"packageName": "dotnet10.0",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:10"
],
"defaultStatus": "unaffected",
"packageName": "dotnet8.0",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:10"
],
"defaultStatus": "unaffected",
"packageName": "dotnet9.0",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:8"
],
"defaultStatus": "unaffected",
"packageName": "dotnet10.0",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:8"
],
"defaultStatus": "unaffected",
"packageName": "dotnet8.0",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:8"
],
"defaultStatus": "unaffected",
"packageName": "dotnet9.0",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9"
],
"defaultStatus": "unaffected",
"packageName": "dotnet10.0",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9"
],
"defaultStatus": "unaffected",
"packageName": "dotnet8.0",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9"
],
"defaultStatus": "unaffected",
"packageName": "dotnet9.0",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"defaultStatus": "unaffected",
"packageName": "dotnet10.0",
"product": "Red Hat Hardened Images",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"defaultStatus": "unaffected",
"packageName": "dotnet8.0",
"product": "Red Hat Hardened Images",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"defaultStatus": "unaffected",
"packageName": "dotnet9.0",
"product": "Red Hat Hardened Images",
"vendor": "Red Hat"
}
],
"datePublic": "2026-04-14T16:57:53.069Z",
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in .NET Framework. An unauthorized attacker can exploit a race condition, which is a concurrent execution using shared resources with improper synchronization, to deny service over a network. This vulnerability can lead to a Denial of Service (DoS) for affected systems."
}
],
"metrics": [
{
"other": {
"content": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"value": "Important"
},
"type": "Red Hat severity rating"
}
},
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-366",
"description": "Race Condition within a Thread",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-15T01:18:11.295Z",
"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"shortName": "redhat-SADP"
},
"references": [
{
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/security/cve/CVE-2026-23666"
},
{
"name": "RHBZ#2458271",
"tags": [
"issue-tracking",
"x_refsource_REDHAT"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458271"
},
{
"tags": [
"x_sadp-csaf-vex"
],
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23666.json"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-04-14T18:01:54.434Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-04-14T16:57:53.069Z",
"value": "Made public."
}
],
"title": "dotnet: .NET Framework: Denial of Service via Race Condition",
"x_adpType": "supplier",
"x_generator": {
"engine": "sadp-cli 1.0.0"
}
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-23666",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-15T13:40:59.739058Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-15T13:41:03.726Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"platforms": [
"Windows Server 2012",
"Windows Server 2012 (Server Core installation)",
"Windows Server 2012 R2",
"Windows Server 2012 R2 (Server Core installation)"
],
"product": "Microsoft .NET Framework 3.5",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.8982 \u0026 3.0.30729.8976",
"status": "affected",
"version": "3.5.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems"
],
"product": "Microsoft .NET Framework 3.5 AND 4.7.2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.7.4141.0",
"status": "affected",
"version": "4.7.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems",
"Windows 10 Version 21H2 for 32-bit Systems",
"Windows 10 Version 21H2 for ARM64-based Systems",
"Windows 10 Version 21H2 for x64-based Systems",
"Windows 10 Version 22H2 for 32-bit Systems",
"Windows 10 Version 22H2 for ARM64-based Systems",
"Windows 10 Version 22H2 for x64-based Systems",
"Windows Server 2022",
"Windows Server 2022 (Server Core installation)"
],
"product": "Microsoft .NET Framework 3.5 AND 4.8",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.8.4801.0",
"status": "affected",
"version": "4.8.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 21H2 for 32-bit Systems",
"Windows 10 Version 21H2 for ARM64-based Systems",
"Windows 10 Version 21H2 for x64-based Systems",
"Windows 10 Version 22H2 for 32-bit Systems",
"Windows 10 Version 22H2 for ARM64-based Systems",
"Windows 10 Version 22H2 for x64-based Systems",
"Windows 11 Version 22H2 for ARM64-based Systems",
"Windows 11 Version 22H2 for x64-based Systems",
"Windows 11 Version 23H2 for ARM64-based Systems",
"Windows 11 Version 23H2 for x64-based Systems",
"Windows 11 Version 24H2 for ARM64-based Systems",
"Windows 11 Version 24H2 for x64-based Systems",
"Windows 11 Version 25H2 for ARM64-based Systems",
"Windows 11 Version 25H2 for x64-based Systems",
"Windows 11 Version 26H1 for ARM64-based Systems",
"Windows 11 version 26H1 for x64-based Systems",
"Windows Server 2022",
"Windows Server 2022 (Server Core installation)",
"Windows Server 2022, 23H2 Edition (Server Core installation)",
"Windows Server 2025",
"Windows Server 2025 (Server Core installation)"
],
"product": "Microsoft .NET Framework 3.5 AND 4.8.1",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.9181 \u0026 3.0.30729.9165 \u0026 4.8.9332.0",
"status": "affected",
"version": "4.8.1",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows Server 2012",
"Windows Server 2012 (Server Core installation)",
"Windows Server 2012 R2",
"Windows Server 2012 R2 (Server Core installation)"
],
"product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "4.8.4801.0",
"status": "affected",
"version": "4.7.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 1607 for 32-bit Systems",
"Windows 10 Version 1607 for x64-based Systems",
"Windows Server 2012",
"Windows Server 2012 (Server Core installation)",
"Windows Server 2012 R2",
"Windows Server 2012 R2 (Server Core installation)"
],
"product": "Microsoft .NET Framework 4.8",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "4.8.4801.0",
"status": "affected",
"version": "4.8.0",
"versionType": "custom"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.8.4801.0",
"versionStartIncluding": "4.8.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.8.4801.0",
"versionStartIncluding": "4.8.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.7.4141.0",
"versionStartIncluding": "4.7.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.8.4801.0",
"versionStartIncluding": "4.7.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.0.50727.9181 \u0026 3.0.30729.9165 \u0026 4.8.9332.0",
"versionStartIncluding": "4.8.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.0.50727.8982 \u0026 3.0.30729.8976",
"versionStartIncluding": "3.5.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"datePublic": "2026-04-14T14:00:00.000Z",
"descriptions": [
{
"lang": "en-US",
"value": "Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en-US",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-755",
"description": "CWE-755: Improper Handling of Exceptional Conditions",
"lang": "en-US",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-15T15:53:06.154Z",
"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"shortName": "microsoft"
},
"references": [
{
"name": ".NET Framework Denial of Service Vulnerability",
"tags": [
"vendor-advisory",
"patch"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666"
}
],
"title": ".NET Framework Denial of Service Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"assignerShortName": "microsoft",
"cveId": "CVE-2026-23666",
"datePublished": "2026-04-14T16:57:53.069Z",
"dateReserved": "2026-01-14T16:59:33.464Z",
"dateUpdated": "2026-10-15T15:53:06.154Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
Loading timeline…
Loading…
Loading…
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.
Loading…
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.