CVE-2026-49451— Microsoft.OpenAPI: Circular schema references may terminate OpenAPI parsing
Possible ATT&CK Techniques 1AI
T1203 · Exploitation for Client ExecutionAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| microsoft | OpenAPI.NET | >= 2.0.0-preview11, < 2.7.5 | affected |
>= 3.0.0, < 3.5.4 | affected |
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I. Basic Information for CVE-2026-49451
Vulnerability Information
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Vulnerability Title
Microsoft.OpenAPI: Circular schema references may terminate OpenAPI parsing
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未经控制的递归
Source: NVD (National Vulnerability Database)
Vulnerability Title
microsoft OpenAPI.NET 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft OpenAPI.NET是美国Microsoft公司的一个用于处理OpenAPI规范的库。 Microsoft OpenAPI.NET 2.0.0-preview11版本至2.7.5之前版本和3.0.0版本至3.5.4之前版本存在资源管理错误漏洞，该漏洞源于包含循环模式引用的OpenAPI文档可能导致通过堆栈溢出终止进程。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| microsoft | OpenAPI.NET | >= 2.0.0-preview11, < 2.7.5 | - |
II. Public POCs for CVE-2026-49451
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 8665 chars
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III. Intelligence Information for CVE-2026-49451
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Vendor Advisories for CVE-2026-49451 (1)
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