a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposure

{
  "id": "1ab1c805d27559c74a3089ec3cfda829458df5a6f9cfc201e89ebf0f3d0bb443",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116477",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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 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.",
    "evidence": "cve:CVE-2026-116477",
    "products": [
      {
        "name": {
          "value": "a2a-dotnet",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-116477",
      "aliases": [
        "CVE-2026-116477"
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X"
          }
        },
        {
          "cvssV3_1": {
            "version": "3.1",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "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"
          }
        },
        {
          "cvssV3_0": {
            "version": "3.0",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:X/RL:O/RC:C"
          }
        },
        {
          "cvssV2_0": {
            "version": "2.0",
            "baseScore": 4,
            "vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N/E:ND/RL:OF/RC:C"
          }
        }
      ],
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:a2aproject:a2a-dotnet:*:*:*:*:*:*:*:*"
          ],
          "vendor": "a2aproject",
          "modules": [
            "Parser"
          ],
          "product": "a2a-dotnet",
          "versions": [
            {
              "status": "affected",
              "version": "1.0.0-preview2"
            },
            {
              "status": "unaffected",
              "version": "1.0.0-preview3"
            }
          ]
        }
      ],
      "modified": "2026-10-26T19:15:22.114Z",
      "provider": "cve",
      "references": [
        "https://vuldb.com/vuln/426390",
        "https://vuldb.com/vuln/426390/cti",
        "https://vuldb.com/cve/CVE-2026-116477",
        "https://vuldb.com/submit/1014890",
        "https://github.com/a2aproject/a2a-dotnet/pull/452",
        "https://github.com/a2aproject/a2a-dotnet/commit/ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4",
        "https://github.com/a2aproject/a2a-dotnet/releases/tag/v1.0.0-preview3",
        "https://github.com/a2aproject/a2a-dotnet/"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
          "shortName": "VulDB",
          "dateUpdated": "2026-10-26T19:15:22.114Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-116477",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 336483,
  "published_at": "2026-10-26T19:15:22.114+00:00"
}