---
id: "CVE-2026-117507"
kind: "vulnerability"
aliases: ["CVE-2026-117507"]
title: "a2a-java: race condition in TaskManager.saveTaskEvent up to 1.2.0.Final"
severity: "medium"
cvss: 5.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["a2a-java", "agent-to-agent", "java", "package"]
not_affected_if: ["not-using-a2a-java", "version-1.3.0-or-later"]
published_at: "2026-10-27T15:16:57+00:00"
first_seen_at: "2026-10-27T15:32:58+00:00"
updated_at: "2026-10-27T15:33:28+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117507", "first_seen_at": "2026-10-27T15:32:58+00:00"}]
---

# a2a-java: race condition in TaskManager.saveTaskEvent up to 1.2.0.Final

The a2a-java library (the Java implementation of the Agent2Agent protocol) has a race condition in TaskManager.saveTaskEvent, the function that stores task events. The sources say an attacker can trigger it remotely, but they do not say what the attacker gains beyond the race itself.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the a2a-java version in the project's build file (pom.xml or build.gradle) and confirm whether it is `1.2.0.Final` or earlier.
- Search dependencies for `TaskManager` from `io.github.a2asdk` or `a2aproject` packages to confirm the library is in use.

## Fix

- Upgrade a2a-java to `1.3.0.Final` or later (patch identifier 6b8e1e085c35e970ef0048901cd25850e4791ec2).

## Timeline

- 2026-10-27T15:32:58+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117507

## From the sources

A security vulnerability has been detected in a2aproject a2a-java up to 1.2.0.Final. This impacts the function TaskManager.saveTaskEvent. The manipulation leads to race condition. The attack may be initiated remotely. Upgrading to version 1.3.0.Final will fix this issue. The identifier of the patch is 6b8e1e085c35e970ef0048901cd25850e4791ec2. The affected component should be upgraded.

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