CVE-2026-116477 Details
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.
A vulnerability allowing information exposure through error messages has been identified in the A2A Project A2A-Dotnet library, in versions up to 1.0.0-preview2. The issue arises in the A2AJsonRpcProcessor.ProcessRequestAsync function within the A2A.AspNetCore component, specifically in the file A2AJsonRpcProcessor.cs. This vulnerability can be exploited remotely by sending crafted JSON-RPC requests that trigger parse errors. The error responses inadvertently leak internal details about the JSON parsing process, such as paths, line numbers, and library names, which could be useful for an attacker.
Upgrade to A2A-Dotnet version 1.0.0-preview3, which includes a patch for this vulnerability by sanitizing error messages to remove internal parsing details. The updated version can be installed via NuGet.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 26, 2026CISA-ADP
Assessed Oct 31, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/a2aproject/a2a-dotnet/ | [email protected] | Vendor |
| https://github.com/a2aproject/a2a-dotnet/commit/ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4 | [email protected] | Source CodeVendor |
| https://github.com/a2aproject/a2a-dotnet/pull/452 | [email protected] | Issue TrackingVendor |
| https://github.com/a2aproject/a2a-dotnet/releases/tag/v1.0.0-preview3 | [email protected] | Release NotesVendor |
| https://vuldb.com/cve/CVE-2026-116477 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1014890 | [email protected] | Permission Required |
| https://vuldb.com/vuln/426390 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/426390/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-200 | Exposure of Sensitive Information to an Unauthorized Actor | [email protected] |
| CWE-209 | Generation of Error Message Containing Sensitive Information | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| a2aproject a2a-dotnet | <= 1.0.0-preview2 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 31, 2026 | CVE Modified | CISA-ADP |
| Oct 26, 2026 | New CVE Received | [email protected] |