---
id: CVE-2026-116477
title: >-
  a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs
  A2AJsonRpcProcessor.ProcessRequestAsync information exposure
summary: >-
  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…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:X/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-209
  - CWE-200
vendor: a2aproject
product: a2a-dotnet
affected:
  - a2a-dotnet 1.0.0-preview2
published: '2026-10-26'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T19:15:22.114Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116477'
references:
  - url: 'https://vuldb.com/vuln/426390'
    label: >-
      VDB-426390 | a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs
      A2AJsonRpcProcessor.ProcessRequestAsync information exposure
  - url: 'https://vuldb.com/vuln/426390/cti'
    label: 'VDB-426390 | CTI Indicators (IOB, IOC, TTP, IOA)'
  - url: 'https://vuldb.com/cve/CVE-2026-116477'
    label: CVE-2026-116477 | CVE Analysis and Report
  - url: 'https://vuldb.com/submit/1014890'
    label: 'Submit #1014890 | a2aproject a2a-dotnet ≤ v1.0.0-preview2 CWE-209'
  - url: 'https://github.com/a2aproject/a2a-dotnet/pull/452'
  - url: >-
      https://github.com/a2aproject/a2a-dotnet/commit/ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4
  - url: 'https://github.com/a2aproject/a2a-dotnet/releases/tag/v1.0.0-preview3'
  - url: 'https://github.com/a2aproject/a2a-dotnet/'
tags:
  - cve.org
ingestedAt: '2026-10-26T19:38:01.146Z'
epss: 0.00315
epssPercentile: 0.24282
---

## Overview

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.

## Affected

- `a2a-dotnet 1.0.0-preview2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.