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CVE-2026-90819— a2aproject a2a-java Authorization Header Construction BasePushNotificationSender.java BasePushNotificationSender.dispatchNotification response splitting

Quick assessment

Affected
a2aproject a2a-java
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 a2aproject a2a-java 1.2.0 中发现一个安全漏洞。受影响的元素是位于文件 中的 函数，属于“Authorization Header Construction”（授权头构建）组件。该操作会导致 HTTP 响应拆分（HTTP Response Splitting）攻击。此攻击可远程发起。升级到版本 1.3.0 即可修复此问题。补丁名称为：247a655043f145f6f8e3853724b6a543eaa02001。建议升级受影响的组件。

CVSS 7.3 · High

Possible ATT&CK Techniques 1 AI

T1595 · Active Scanning
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I. Basic Information for CVE-2026-90819

Vulnerability Information
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Vulnerability Title
a2aproject a2a-java Authorization Header Construction BasePushNotificationSender.java BasePushNotificationSender.dispatchNotification response splitting
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP头部中CRLF序列转义处理不恰当(HTTP响应分割)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
a2aproject a2a-java 1.2.0 cpe:2.3:a:a2aproject:a2a-java:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-90819

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III. Intelligence Information for CVE-2026-90819

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Patches & Fixes for CVE-2026-90819 (3)

Vendor Pages for CVE-2026-90819 (2)

Same Patch Batch · a2aproject · 2026-09-14 · 3 CVEs total

CVE-2026-90790 6.3 MEDIUM a2aproject a2a-python Push Notification Sender base_push_notification_sender.py _dispatch_
CVE-2026-90820 4.3 MEDIUM a2aproject a2a-java AuthorizationRequestHandlerDecorator.java AuthorizationRequestHandlerD

IV. Related Vulnerabilities

Same product: a2a-java
Same vendor: a2aproject
Same weakness: CWE-113

V. Comments for CVE-2026-90819

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