CVE-2026-116477

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

State: Published
Severity: 5.3 Medium
Published: Oct 26, 2026
Updated: Oct 31, 2026
Reserved: Oct 26, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	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	VulDB
3.1	4.3 Medium	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	VulDB
3.0	4.3 Medium	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	VulDB
2.0	4.0 Medium	AV:N/AC:L/Au:S/C:P/I:N/A:N/E:ND/RL:OF/RC:C	VulDB

Weaknesses

CWE-209 Information Exposure Through Error Message
CWE-200 Information Disclosure

Affected Products

Product	Versions
a2a-dotneta2aproject	1.0.0-preview2Affected 1.0.0-preview3Not affected

References

VDB-426390 | a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposurevdb-entrytechnical-description
VDB-426390 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
CVE-2026-116477 | CVE Analysis and Reportthird-party-advisory
Submit #1014890 | a2aproject a2a-dotnet ≤ v1.0.0-preview2 CWE-209third-party-advisory
https://github.com/a2aproject/a2a-dotnet/pull/452issue-trackingpatch
https://github.com/a2aproject/a2a-dotnet/commit/ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4patch
https://github.com/a2aproject/a2a-dotnet/releases/tag/v1.0.0-preview3patch
https://github.com/a2aproject/a2a-dotnet/product

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