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    4 vulnerabilities found for OpenAPI.NET by microsoft

    CVE-2026-72923 (GCVE-0-2026-72923)

    Vulnerability from nvd – Published: 2026-09-08 17:12 – Updated: 2026-10-14 20:08
    VLAI
    Title
    Microsoft.OpenApi.YamlReader vulnerable to denial of service via YAML alias expansion
    Summary
    The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. In Microsoft.OpenApi.Readers versions before 1.6.30 and Microsoft.OpenApi.YamlReader from 2.0.0-preview.11 through 2.11.0 and 3.0.0 through 3.9.0, parsing a YAML OpenAPI document with nested anchors and aliases can consume uncontrolled memory. SharpYaml represents aliases as shared nodes in a small directed acyclic graph, but conversion to independent OpenAPI or System.Text.Json.Nodes.JsonNode trees duplicates every aliased path; without a node-count or nesting-depth limit, N nested anchors referenced k times can require k^N materialized nodes and terminate the process through an out-of-memory condition. The fixed readers bound materialization to 5,000,000 nodes and a nesting depth of 64 by default and report an OpenApiDiagnostic error when a limit is exceeded. This vulnerability is fixed in Microsoft.OpenApi.Readers 1.6.30 and Microsoft.OpenApi.YamlReader 2.12.0 and 3.10.0.
    Severity
    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 2026-09-08 17:36 UTC
    CWE
    • CWE-400 - Uncontrolled Resource Consumption
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7652 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    microsoft OpenAPI.NET Affected: >= 3.0.0, < 3.10.0
    Affected: >= 2.0.0-preview.11, < 2.12.0
    Affected: < 1.6.30
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-49451 (GCVE-0-2026-49451)

    Vulnerability from nvd – Published: 2026-06-30 16:01 – Updated: 2026-06-30 18:58
    VLAI
    Title
    Microsoft.OpenAPI: Circular schema references may terminate OpenAPI parsing
    Summary
    The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a small OpenAPI document containing a circular schema reference can cause process termination through stack overflow in Microsoft.OpenApi. The issue affects OpenAPI document parsing through public OpenAPI.NET reader APIs and has been confirmed across both JSON and YAML reader paths. This vulnerability is fixed in 2.7.5 and 3.5.4.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-06-30 18:57 UTC
    CWE
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7652 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    microsoft OpenAPI.NET Affected: >= 2.0.0-preview11, < 2.7.5
    Affected: >= 3.0.0, < 3.5.4
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-72923 (GCVE-0-2026-72923)

    Vulnerability from cvelistv5 – Published: 2026-09-08 17:12 – Updated: 2026-10-14 20:08
    VLAI
    Title
    Microsoft.OpenApi.YamlReader vulnerable to denial of service via YAML alias expansion
    Summary
    The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. In Microsoft.OpenApi.Readers versions before 1.6.30 and Microsoft.OpenApi.YamlReader from 2.0.0-preview.11 through 2.11.0 and 3.0.0 through 3.9.0, parsing a YAML OpenAPI document with nested anchors and aliases can consume uncontrolled memory. SharpYaml represents aliases as shared nodes in a small directed acyclic graph, but conversion to independent OpenAPI or System.Text.Json.Nodes.JsonNode trees duplicates every aliased path; without a node-count or nesting-depth limit, N nested anchors referenced k times can require k^N materialized nodes and terminate the process through an out-of-memory condition. The fixed readers bound materialization to 5,000,000 nodes and a nesting depth of 64 by default and report an OpenApiDiagnostic error when a limit is exceeded. This vulnerability is fixed in Microsoft.OpenApi.Readers 1.6.30 and Microsoft.OpenApi.YamlReader 2.12.0 and 3.10.0.
    Severity
    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 2026-09-08 17:36 UTC
    CWE
    • CWE-400 - Uncontrolled Resource Consumption
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7652 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    microsoft OpenAPI.NET Affected: >= 3.0.0, < 3.10.0
    Affected: >= 2.0.0-preview.11, < 2.12.0
    Affected: < 1.6.30
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-49451 (GCVE-0-2026-49451)

    Vulnerability from cvelistv5 – Published: 2026-06-30 16:01 – Updated: 2026-06-30 18:58
    VLAI
    Title
    Microsoft.OpenAPI: Circular schema references may terminate OpenAPI parsing
    Summary
    The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a small OpenAPI document containing a circular schema reference can cause process termination through stack overflow in Microsoft.OpenApi. The issue affects OpenAPI document parsing through public OpenAPI.NET reader APIs and has been confirmed across both JSON and YAML reader paths. This vulnerability is fixed in 2.7.5 and 3.5.4.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-06-30 18:57 UTC
    CWE
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7652 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    microsoft OpenAPI.NET Affected: >= 2.0.0-preview11, < 2.7.5
    Affected: >= 3.0.0, < 3.5.4
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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        {
          "lang": "en",
          "value": "The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a small OpenAPI document containing a circular schema reference can cause process termination through stack overflow in Microsoft.OpenApi. The issue affects OpenAPI document parsing through public OpenAPI.NET reader APIs and has been confirmed across both JSON and YAML reader paths. This vulnerability is fixed in 2.7.5 and 3.5.4."
        }
      ],
      "metrics": [
        {
          "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-674",
              "description": "CWE-674: Uncontrolled Recursion",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-30T16:01:00.819Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/microsoft/OpenAPI.NET/security/advisories/GHSA-v5pm-xwqc-g5wc",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/microsoft/OpenAPI.NET/security/advisories/GHSA-v5pm-xwqc-g5wc"
        }
      ],
      "source": {
        "advisory": "GHSA-v5pm-xwqc-g5wc",
        "discovery": "UNKNOWN"
      },
      "title": "Microsoft.OpenAPI: Circular schema references may terminate OpenAPI parsing"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-49451",
    "datePublished": "2026-06-30T16:01:00.819Z",
    "dateReserved": "2026-05-30T02:43:33.106Z",
    "dateUpdated": "2026-06-30T18:58:34.623Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}