CVE-2026-116477

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

MEDIUM
4.3
CVSS Score
Published: October 26, 2026 at 07:15 PM UTC
Updated: October 31, 2026 at 02:17 AM UTC
1 product affected across 1 vendora2a-dotnet

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vendor states this is fixed in 1.0.0-preview3 (unaffected)

References (8)

VDB EntryTechnical Description
Source: cverecord
https://vuldb.com/vuln/426390
SignaturePermissions Required
Source: cverecord
https://vuldb.com/vuln/426390/cti
Third Party Advisory
Source: cverecord
https://vuldb.com/cve/CVE-2026-116477
Third Party Advisory
Source: cverecord
https://vuldb.com/submit/1014890
Issue TrackingPatch
Source: cverecord
https://github.com/a2aproject/a2a-dotnet/pull/452

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMVulDB
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-209CWE-200

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