---
id: CVE-2026-117504
title: >-
  a2aproject a2a-go Distributed Manager distributed_manager.go Cancel denial of
  service
summary: >-
  A vulnerability was identified in a2aproject a2a-go up to 2.4.0. The affected
  element is the function Cancel of the file
  internal/taskexec/distributed_manager.go of the component Distributed Manager.
  Such manipulation leads to denial of …
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-404
vendor: a2aproject
product: a2a-go
affected:
  - a2a-go 2.0
  - a2a-go 2.1
  - a2a-go 2.2
  - a2a-go 2.3
  - a2a-go 2.4.0
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T14:00:17.060Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-117504'
references:
  - url: 'https://vuldb.com/vuln/427071'
    label: >-
      VDB-427071 | a2aproject a2a-go Distributed Manager distributed_manager.go
      Cancel denial of service
  - url: 'https://vuldb.com/vuln/427071/cti'
    label: 'VDB-427071 | CTI Indicators (IOB, IOC, TTP, IOA)'
  - url: 'https://vuldb.com/cve/CVE-2026-117504'
    label: CVE-2026-117504 | CVE Analysis and Report
  - url: 'https://vuldb.com/submit/1015053'
    label: 'Submit #1015053 | a2aproject a2a-go ≤ v2.4.0 CWE-404'
  - url: 'https://github.com/a2aproject/a2a-go/pull/409'
  - url: >-
      https://github.com/a2aproject/a2a-go/commit/14e41a978b31e134ffa1170d8657f9dd98529aa3
  - url: 'https://github.com/a2aproject/a2a-go/releases/tag/v2.5.0'
  - url: 'https://github.com/a2aproject/a2a-go/'
tags:
  - cve.org
ingestedAt: '2026-10-27T16:11:59.353Z'
---

## Overview

A vulnerability was identified in a2aproject a2a-go up to 2.4.0. The affected element is the function Cancel of the file internal/taskexec/distributed_manager.go of the component Distributed Manager. Such manipulation leads to denial of service. It is possible to launch the attack remotely. Upgrading to version 2.5.0 is sufficient to fix this issue. The name of the patch is 14e41a978b31e134ffa1170d8657f9dd98529aa3. Upgrading the affected component is advised.

## Affected

- `a2a-go 2.0`
- `a2a-go 2.1`
- `a2a-go 2.2`
- `a2a-go 2.3`
- `a2a-go 2.4.0`

## Remediation

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