GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-23666 (GCVE-0-2026-23666)

Vulnerability from cvelistv5 – Published: 2026-04-14 16:57 – Updated: 2026-08-14 16:30
VLAI
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
7.5 (High)
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
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-15 13:40 UTC
CWE
  • CWE-755 - Improper Handling of Exceptional Conditions
  • CWE-366 - Race Condition within a Thread
Assigner
References
Impacted 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 Create a notification for this product.
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 Create a notification for this product.
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 Create a notification for this product.
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 Create a notification for this product.
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 Create a notification for this product.
Microsoft Microsoft .NET Framework 4.8 Affected: 4.8.0 , < 4.8.4801.0 (custom)
guessed Create a notification for this product.
Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
Create a notification for this product.
Red Hat Red Hat Hardened Images     cpe:/a:redhat:hummingbird:1
Create a notification for this product.
Date Public
2026-04-14 14:00
Show details on NVD website
To clipboard 

{
  "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": "2026-08-14T16:30:50.288Z",
        "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": "2026-08-14T16:30:50.288Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-23666",
      "date": "2026-09-16",
      "epss": "0.0133",
      "percentile": "0.69623"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23666\",\"sourceIdentifier\":\"secure@microsoft.com\",\"published\":\"2026-04-14T18:16:44.507\",\"lastModified\":\"2026-07-15T02:18:43.713\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.\"}],\"affected\":[{\"source\":\"secure@microsoft.com\",\"affectedData\":[{\"vendor\":\"Microsoft\",\"product\":\"Microsoft .NET Framework 3.5\",\"platforms\":[\"Windows Server 2012\",\"Windows Server 2012 (Server Core installation)\",\"Windows Server 2012 R2\",\"Windows Server 2012 R2 (Server Core installation)\"],\"versions\":[{\"version\":\"3.5.0\",\"lessThan\":\"2.0.50727.8982 \u0026 3.0.30729.8976\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Microsoft\",\"product\":\"Microsoft .NET Framework 3.5 AND 4.7.2\",\"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\"],\"versions\":[{\"version\":\"4.7.0\",\"lessThan\":\"2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.7.4141.0\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Microsoft\",\"product\":\"Microsoft .NET Framework 3.5 AND 4.8\",\"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)\"],\"versions\":[{\"version\":\"4.8.0\",\"lessThan\":\"2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.8.4801.0\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Microsoft\",\"product\":\"Microsoft .NET Framework 3.5 AND 4.8.1\",\"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)\"],\"versions\":[{\"version\":\"4.8.1\",\"lessThan\":\"2.0.50727.9181 \u0026 3.0.30729.9165 \u0026 4.8.9332.0\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Microsoft\",\"product\":\"Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2\",\"platforms\":[\"Windows Server 2012\",\"Windows Server 2012 (Server Core installation)\",\"Windows Server 2012 R2\",\"Windows Server 2012 R2 (Server Core installation)\"],\"versions\":[{\"version\":\"4.7.0\",\"lessThan\":\"4.8.4801.0\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Microsoft\",\"product\":\"Microsoft .NET Framework 4.8\",\"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)\"],\"versions\":[{\"version\":\"4.8.0\",\"lessThan\":\"4.8.4801.0\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"affectedData\":[{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 10\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://access.redhat.com/downloads/content/package-browser/\",\"packageName\":\"dotnet10.0\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:10\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 10\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://access.redhat.com/downloads/content/package-browser/\",\"packageName\":\"dotnet8.0\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:10\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 10\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://access.redhat.com/downloads/content/package-browser/\",\"packageName\":\"dotnet9.0\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:10\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 8\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://access.redhat.com/downloads/content/package-browser/\",\"packageName\":\"dotnet10.0\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:8\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 8\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://access.redhat.com/downloads/content/package-browser/\",\"packageName\":\"dotnet8.0\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:8\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 8\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://access.redhat.com/downloads/content/package-browser/\",\"packageName\":\"dotnet9.0\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:8\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 9\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://access.redhat.com/downloads/content/package-browser/\",\"packageName\":\"dotnet10.0\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:9\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 9\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://access.redhat.com/downloads/content/package-browser/\",\"packageName\":\"dotnet8.0\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:9\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux 9\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://access.redhat.com/downloads/content/package-browser/\",\"packageName\":\"dotnet9.0\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:9\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Hardened Images\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://access.redhat.com/downloads/content/package-browser/\",\"packageName\":\"dotnet10.0\",\"cpes\":[\"cpe:/a:redhat:hummingbird:1\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Hardened Images\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://access.redhat.com/downloads/content/package-browser/\",\"packageName\":\"dotnet8.0\",\"cpes\":[\"cpe:/a:redhat:hummingbird:1\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Hardened Images\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://access.redhat.com/downloads/content/package-browser/\",\"packageName\":\"dotnet9.0\",\"cpes\":[\"cpe:/a:redhat:hummingbird:1\"]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"secure@microsoft.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-04-15T13:40:59.739058Z\",\"id\":\"CVE-2026-23666\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"secure@microsoft.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-755\"}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-366\"}]}],\"configurations\":[{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"23317443-1968-4791-9F20-AD3B308A83D1\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"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\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"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\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"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\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"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\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"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\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"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\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"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_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\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"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\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"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\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"2D3F18AF-84ED-473B-A8DF-65EB23C475AF\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"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\"}]}]}],\"references\":[{\"url\":\"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666\",\"source\":\"secure@microsoft.com\",\"tags\":[\"Vendor Advisory\"]},{\"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\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"}]}}",
    "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\": [{\"title\": \"dotnet: .NET Framework: Denial of Service via Race Condition\", \"metrics\": [{\"other\": {\"type\": \"Red Hat severity rating\", \"content\": {\"value\": \"Important\", \"namespace\": \"https://access.redhat.com/security/updates/classification/\"}}}, {\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"cpes\": [\"cpe:/o:redhat:enterprise_linux:10\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 10\", \"packageName\": \"dotnet10.0\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:10\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 10\", \"packageName\": \"dotnet8.0\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:10\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 10\", \"packageName\": \"dotnet9.0\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:8\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 8\", \"packageName\": \"dotnet10.0\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:8\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 8\", \"packageName\": \"dotnet8.0\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:8\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 8\", \"packageName\": \"dotnet9.0\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 9\", \"packageName\": \"dotnet10.0\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 9\", \"packageName\": \"dotnet8.0\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 9\", \"packageName\": \"dotnet9.0\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/a:redhat:hummingbird:1\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Hardened Images\", \"packageName\": \"dotnet10.0\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/a:redhat:hummingbird:1\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Hardened Images\", \"packageName\": \"dotnet8.0\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/a:redhat:hummingbird:1\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Hardened Images\", \"packageName\": \"dotnet9.0\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}], \"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.\"}], \"x_adpType\": \"supplier\", \"datePublic\": \"2026-04-14T16:57:53.069Z\", \"references\": [{\"url\": \"https://access.redhat.com/security/cve/CVE-2026-23666\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2458271\", \"name\": \"RHBZ#2458271\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23666.json\", \"tags\": [\"x_sadp-csaf-vex\"]}], \"x_generator\": {\"engine\": \"sadp-cli 1.0.0\"}, \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-366\", \"description\": \"Race Condition within a Thread\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-07-15T01:18:11.295Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-23666\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-15T13:40:59.739058Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-15T13:41:03.726Z\"}}], \"cna\": {\"title\": \".NET Framework Denial of Service Vulnerability\", \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"version\": \"3.1\", \"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\"}, \"scenarios\": [{\"lang\": \"en-US\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Microsoft\", \"product\": \"Microsoft .NET Framework 3.5\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.5.0\", \"lessThan\": \"2.0.50727.8982 \u0026 3.0.30729.8976\", \"versionType\": \"custom\"}], \"platforms\": [\"Windows Server 2012\", \"Windows Server 2012 (Server Core installation)\", \"Windows Server 2012 R2\", \"Windows Server 2012 R2 (Server Core installation)\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft .NET Framework 3.5 AND 4.7.2\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.7.0\", \"lessThan\": \"2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.7.4141.0\", \"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\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft .NET Framework 3.5 AND 4.8\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.8.0\", \"lessThan\": \"2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.8.4801.0\", \"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)\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft .NET Framework 3.5 AND 4.8.1\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.8.1\", \"lessThan\": \"2.0.50727.9181 \u0026 3.0.30729.9165 \u0026 4.8.9332.0\", \"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)\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.7.0\", \"lessThan\": \"4.8.4801.0\", \"versionType\": \"custom\"}], \"platforms\": [\"Windows Server 2012\", \"Windows Server 2012 (Server Core installation)\", \"Windows Server 2012 R2\", \"Windows Server 2012 R2 (Server Core installation)\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft .NET Framework 4.8\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.8.0\", \"lessThan\": \"4.8.4801.0\", \"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)\"]}], \"datePublic\": \"2026-04-14T14:00:00.000Z\", \"references\": [{\"url\": \"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666\", \"name\": \".NET Framework Denial of Service Vulnerability\", \"tags\": [\"vendor-advisory\", \"patch\"]}], \"descriptions\": [{\"lang\": \"en-US\", \"value\": \"Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"CWE\", \"cweId\": \"CWE-755\", \"description\": \"CWE-755: Improper Handling of Exceptional Conditions\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.8.4801.0\", \"versionStartIncluding\": \"4.8.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.8.4801.0\", \"versionStartIncluding\": \"4.8.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.7.4141.0\", \"versionStartIncluding\": \"4.7.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.8.4801.0\", \"versionStartIncluding\": \"4.7.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.0.50727.9181 \u0026 3.0.30729.9165 \u0026 4.8.9332.0\", \"versionStartIncluding\": \"4.8.1\"}, {\"criteria\": \"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.0.50727.8982 \u0026 3.0.30729.8976\", \"versionStartIncluding\": \"3.5.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2026-06-19T16:08:15.875Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-23666\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-15T01:18:11.295Z\", \"dateReserved\": \"2026-01-14T16:59:33.464Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2026-04-14T16:57:53.069Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


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.