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CVE-2026-116477— a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposure

Quick assessment

Affected
a2aproject a2a-dotnet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 a2aproject 的 a2a-dotnet 组件（版本 1.0.0-preview2 及更早版本）中发现一个安全漏洞。受影响的元素是 Parser 组件中文件 src/A2A.AspNetCore/A2AJsonRpcProcessor.cs 里的函数 A2AJsonRpcProcessor.ProcessRequestAsync。该漏洞可通过操纵输入导致错误信息泄露，攻击者可从远程发起攻击。升级到版本 1.0.0-preview3 即可修复此问题。修复补丁的标识符为 ccbd12b6108a6a8f0fd

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-116477

Vulnerability Information
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Vulnerability Title
a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposure
Source: CVE Program / CVE List V5
Vulnerability Description
A security vulnerability has been detected in a2aproject a2a-dotnet up to 1.0.0-preview2. The impacted element is the function A2AJsonRpcProcessor.ProcessRequestAsync of the file src/A2A.AspNetCore/A2AJsonRpcProcessor.cs of the component Parser. The manipulation leads to information exposure through error message. It is possible to initiate the attack remotely. Upgrading to version 1.0.0-preview3 is sufficient to resolve this issue. The identifier of the patch is ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4. Upgrading the affected component is recommended.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过错误消息导致的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
a2aproject a2a-dotnet 1.0.0-preview2 cpe:2.3:a:a2aproject:a2a-dotnet:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-116477

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III. Intelligence Information for CVE-2026-116477

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Patches & Fixes for CVE-2026-116477 (2)

Vendor Pages for CVE-2026-116477 (2)

Same Patch Batch · a2aproject · 2026-10-26 · 4 CVEs total

CVE-2026-116476 5.4 MEDIUM a2aproject a2a-dotnet TaskProjection TaskProjection.ApplyStatus race condition
CVE-2026-116478 5.3 MEDIUM a2aproject a2a-go Push Notification agentexec.go CreateExecutor information exposure
CVE-2026-116479 4.3 MEDIUM a2aproject a2a-java JSON-RPC Error getMessage information exposure

IV. Related Vulnerabilities

Same product: a2a-dotnet
Same vendor: a2aproject
Same weakness: CWE-209