CVE-2026-111761— A2A Java SDK 推送通知 SSRF 漏洞
一分钟漏洞结论
影响对象
a2aproject a2a-java
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
A2A Java SDK 是 Agent2Agent（A2A）协议的官方 Java 软件开发工具包。在 1.3.0.Final 版本之前，server-common 模块中的 BasePushNotificationSender 在将任务数据发送至 TaskPushNotificationConfig 中指定的 URL 时，未对目标地址进行验证，未限制协议方案（scheme），也未对重定向次数进行限制。InMemoryPushNotificationConfigStore.setInfo 方法会原样存储该 URL，
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一、 漏洞 CVE-2026-111761 基础信息
漏洞信息
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Vulnerability Title
A2A Java SDK has Server-Side Request Forgery (SSRF) in push-notification delivery
来源: CVE Program / CVE List V5
Vulnerability Description
A2A Java SDK is the official Java SDK for the Agent2Agent (A2A) Protocol. Prior to 1.3.0.Final, BasePushNotificationSender in server-common sends task data to the URL in TaskPushNotificationConfig without destination validation, scheme restrictions, or bounds on redirects. InMemoryPushNotificationConfigStore.setInfo stores the URL verbatim, and onCreateTaskPushNotificationConfig does not validate the destination. In the default deployment with push notifications enabled, an unauthenticated caller can register a destination through an inline SendMessage configuration or CreateTaskPushNotificationConfig for an existing task, causing task status and artifact updates to send requests from the server's network position to loopback, private, link-local cloud-metadata, IPv6 unique-local, unspecified, or multicast destinations where routing permits. JdkA2AHttpClient and VertxA2AHttpClient follow redirects, allowing a webhook redirect to bypass creation-time destination checks and convert a POST into a GET; hostname-only checks also do not prevent DNS rebinding. Direct POST delivery can push attacker-influenced task data into internal services, whereas a redirected POST-to-GET request drops the body. The sender discards the fetched response and does not expose delivery success or failure, so the demonstrated behavior does not provide response read-back. No credentials or user interaction are required. This issue is fixed in version 1.3.0.Final.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| a2aproject | a2a-java | < 1.3.0.Final | - |
|
二、漏洞 CVE-2026-111761 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-111761 厂商页面 (1)
CVE-2026-111761 其他参考 (3)
-
https://github.com/a2aproject/a2a-java/pull/1096 x_refsource_MISC
-
https://github.com/a2aproject/a2a-java/security/advisories/GHSA-q78c-5jjq-57g8 x_refsource_CONFIRM
同批安全公告 · a2aproject · 2026-10-20 · 共 5 条
| CVE-2026-111765 | 7.5 HIGH | A2A Java SDK Android 凭据跨域转发漏洞 |
| CVE-2026-111764 | 7.5 HIGH | A2A Java SDK 任务授权默认开放漏洞 |
| CVE-2026-111762 | 5.7 MEDIUM | A2A Java SDK 明文记录推送凭证漏洞 |
| CVE-2026-111763 | 5.7 MEDIUM | A2A Java SDK 重定向凭据泄露漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-111761
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