Vulnerability · Published Oct 26, 2026 · Assigned by VulDB
CVE-2026-116477a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposure
Medium 4.3
In plain English
A medium-severity information exposure in a2a-dotnet from a2aproject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| a2aproject | a2a-dotnet | 1.0.0-preview2 |
Weakness: CWE-209, CWE-200 · Vector: 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
References
- VDB-426390 | a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposure vdb-entry, technical-description
- VDB-426390 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
- CVE-2026-116477 | CVE Analysis and Report third-party-advisory
- Submit #1014890 | a2aproject a2a-dotnet ≤ v1.0.0-preview2 CWE-209 third-party-advisory
- https://github.com/a2aproject/a2a-dotnet/pull/452 issue-tracking, patch
- https://github.com/a2aproject/a2a-dotnet/commit/ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4 patch
- https://github.com/a2aproject/a2a-dotnet/releases/tag/v1.0.0-preview3 patch
- https://github.com/a2aproject/a2a-dotnet/ product