Information disclosure in A2aproject A2a-Dotnet
CVE-2026-116477
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.
Vulnerability class: Information Disclosure
Published .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- A2aproject A2a-Dotnet — versions 1.0.0-preview2
Weakness classification (CWE)
References
- vuldb.com/vuln/426390 (technical-description, vdb-entry)
- vuldb.com/vuln/426390/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-116477 (third-party-advisory)
- vuldb.com/submit/1014890 (third-party-advisory)
- github.com/a2aproject/a2a-dotnet/pull/452 (issue-tracking, patch)
- github.com/a2aproject/a2a-dotnet/commit/ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4 (patch)
- github.com/a2aproject/a2a-dotnet/releases/tag/v1.0.0-preview3 (patch)
- github.com/a2aproject/a2a-dotnet/ (product)
Frequently asked questions
- What is CVE-2026-116477?
- CVE-2026-116477 is a medium-severity vulnerability in A2aproject A2a-Dotnet, classified under Information Disclosure. CVSS score: 4.3/10. Published 2026-10-26.
- How severe is CVE-2026-116477?
- Medium severity. CVSS v3 base score is 4.3 out of 10.