a2aproject a2a-dotnet up to 1.0.0-preview2 Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposure

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.97

Summaryinfo

A vulnerability was found in a2aproject a2a-dotnet up to 1.0.0-preview2. It has been declared as problematic. This affects the function A2AJsonRpcProcessor.ProcessRequestAsync of the file src/A2A.AspNetCore/A2AJsonRpcProcessor.cs of the component Parser. The manipulation results in information exposure. This vulnerability is known as CVE-2026-116477. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in a2aproject a2a-dotnet up to 1.0.0-preview2. It has been classified as problematic. Affected is the function A2AJsonRpcProcessor.ProcessRequestAsync of the file src/A2A.AspNetCore/A2AJsonRpcProcessor.cs of the component Parser. The manipulation with an unknown input leads to a information exposure vulnerability. CWE is classifying the issue as CWE-209. The product generates an error message that includes sensitive information about its environment, users, or associated data. This is going to have an impact on confidentiality.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-116477. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 1.0.0-preview3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Information exposure
CWE: CWE-209 / CWE-200 / CWE-284
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: a2a-dotnet 1.0.0-preview3
Patch: ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4

Timelineinfo

10/26/2026 Advisory disclosed
10/26/2026 +0 days VulDB entry created
10/26/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 452
Status: Confirmed

CVE: CVE-2026-116477 (🔒)
GCVE (CVE): GCVE-0-2026-116477
GCVE (VulDB): GCVE-100-426390

Entryinfo

Created: 10/26/2026 12:04
Changes: 10/26/2026 12:04 (60)
Complete: 🔍
Submitter: colorfullbz
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #1014890: a2aproject a2a-dotnet ≤ v1.0.0-preview2 CWE-209 (by colorfullbz)

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