---
id: CVE-2026-116479
title: a2aproject a2a-java JSON-RPC Error getMessage information exposure
summary: >-
  A flaw has been found in a2aproject a2a-java up to 1.2.0.Final. This impacts
  the function getMessage of the component JSON-RPC Error Handler. This
  manipulation causes information exposure through error message. The attack can
  be initiate…
severity: medium
cvss: 4.3
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-209
  - CWE-200
vendor: a2aproject
product: a2a-java
affected:
  - a2a-java 1.2.0.Final
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-27T13:41:48.514393Z'
published: '2026-10-26'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T14:18:35.499Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116479'
references:
  - url: 'https://vuldb.com/vuln/426392'
    label: >-
      VDB-426392 | a2aproject a2a-java JSON-RPC Error getMessage information
      exposure
  - url: 'https://vuldb.com/vuln/426392/cti'
    label: 'VDB-426392 | CTI Indicators (IOB, IOC, TTP, IOA)'
  - url: 'https://vuldb.com/cve/CVE-2026-116479'
    label: CVE-2026-116479 | CVE Analysis and Report
  - url: 'https://vuldb.com/submit/1014889'
    label: 'Submit #1014889 | a2aproject a2a-java ≤ v1.2.0.Final CWE-209'
  - url: 'https://github.com/a2aproject/a2a-java/pull/1046'
  - url: >-
      https://github.com/a2aproject/a2a-java/commit/bbee3369f3825d0fba2373d821f6dc6d4fc82ec0
  - url: 'https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final'
  - url: 'https://github.com/a2aproject/a2a-java/'
tags:
  - cve.org
epss: 0.00315
epssPercentile: 0.24281
ingestedAt: '2026-10-26T20:39:42.641Z'
---

## Overview

A flaw has been found in a2aproject a2a-java up to 1.2.0.Final. This impacts the function getMessage of the component JSON-RPC Error Handler. This manipulation causes information exposure through error message. The attack can be initiated remotely. Upgrading to version 1.3.0.Final will fix this issue. Patch name: bbee3369f3825d0fba2373d821f6dc6d4fc82ec0. Upgrading the affected component is advised.

## Affected

- `a2a-java 1.2.0.Final`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.