---
id: CVE-2026-90819
title: A weakness has been identified in a2aproject a2a-java 1.2.0
summary: >-
  A weakness has been identified in a2aproject a2a-java 1.2.0. The affected
  element is the function BasePushNotificationSender.dispatchNotification of the
  file
  server-common/src/main/java/org/a2aproject/sdk/server/tasks/BasePushNotificatio…
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-93
  - CWE-113
vendor: a2aproject
product: a2a-java
affected:
  - a2a-java 1.2.0
published: '2026-09-14'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T15:17:30.050'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90819'
references:
  - url: 'https://github.com/a2aproject/a2a-java/'
    label: cna@vuldb.com
  - url: >-
      https://github.com/a2aproject/a2a-java/commit/247a655043f145f6f8e3853724b6a543eaa02001
    label: cna@vuldb.com
  - url: 'https://github.com/a2aproject/a2a-java/pull/1043'
    label: cna@vuldb.com
  - url: 'https://github.com/a2aproject/a2a-java/pull/1053'
    label: cna@vuldb.com
  - url: 'https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-90819'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/922996'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/403322'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/403322/cti'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-15T14:25:29.392033Z'
epss: 0.00661
epssPercentile: 0.49442
ingestedAt: '2026-09-14T21:15:17.562Z'
---

## Overview

A weakness has been identified in a2aproject a2a-java 1.2.0. The affected element is the function BasePushNotificationSender.dispatchNotification of the file server-common/src/main/java/org/a2aproject/sdk/server/tasks/BasePushNotificationSender.java of the component Authorization Header Construction. This manipulation causes http response splitting. The attack can be initiated remotely. Upgrading to version 1.3.0 is sufficient to fix this issue. Patch name: 247a655043f145f6f8e3853724b6a543eaa02001. You should upgrade the affected component.

## Remediation

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