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CVE-2026-116477medium5.3

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

Impact

The a2aproject a2a-dotnet Parser up to version 1.0.0-preview2 has an information exposure vulnerability in A2AJsonRpcProcessor.cs, where the A2AJsonRpcProcessor.ProcessRequestAsync function can reveal information through error messages, potentially allowing remote attacks. The vulnerability is identified as CWE-209 and CWE-200.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

a2aproject · VulDB

a2a-dotnet

2 ranges
VulDB version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

1.0.0-preview2

unaffected

1.0.0-preview3

unknown

Other versions: unknown

Product identifiers (CPE)cpe:2.3:a:a2aproject:a2a-dotnet:*:*:*:*:*:*:*:*

Original source 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.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-116477

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

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Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-209 ↗

Information Exposure Through Error Message

VulDB

Related →
CWE-200 ↗

Information Disclosure

VulDB

Related →
Contributing organizations · 2
VulDB

Assigning organization

2026-10-26
CISA-ADP

Additional data publisher

2026-10-31

What changed

Follow changes
  1. CVE · CVE-2026-116477

    Observed 2026-10-31T01:57:35.080Z · upstream updated 2026-10-31T01:43:26.819Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-31T01:43:16.112423Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "partial"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

References

8 sources
github.com/a2aproject/a2a-dotnet/pull/452
issue-trackingVulDB
github.com/a2aproject/a2a-dotnet/commit/ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4
patchVulDB
github.com/a2aproject/a2a-dotnet/releases/tag/v1.0.0-preview3
patchVulDB
vuldb.com/vuln/426390
vdb-entryVulDB
vuldb.com/vuln/426390/cti
signatureVulDB
vuldb.com/cve/CVE-2026-116477
third-party-advisoryVulDB
View 2 more references
vuldb.com/submit/1014890
third-party-advisoryVulDB
github.com/a2aproject/a2a-dotnet/
productVulDB