CVE-2026-111765— A2A Java SDK Android 凭据跨域转发漏洞
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 SDK。在版本 1.3.0.Final 至 1.3.2.Final 之前，AndroidA2AHttpClient 的同步 POST 路径在调用 AndroidA2AHttpClient.createConnection() 时，会覆盖已禁用的重定向设置，转而使用 PostBuilder 的默认 followRedirects 值（即 true），导致早期针对凭据重定向问题的修复残留未生效。JSONRPCTransport 和
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一、 漏洞 CVE-2026-111765 基础信息
漏洞信息
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Vulnerability Title
A2A Java SDK: Android synchronous POST forwards credentials across authorities after incomplete redirect fix
来源: CVE Program / CVE List V5
Vulnerability Description
A2A Java SDK is the official Java SDK for the Agent2Agent (A2A) Protocol. Starting in version 1.3.0.Final and prior to version 1.3.2.Final, the AndroidA2AHttpClient synchronous POST path overrides the disabled-redirect setting in AndroidA2AHttpClient.createConnection() with the PostBuilder default followRedirects value of true, leaving a residual of the earlier credential-redirect fix. JSONRPCTransport and RestTransport add interceptor-produced authentication headers and call synchronous post() without disabling redirects. AuthInterceptor permits X-API-Key, API-Key, X-Auth-Token, and X-Authentication headers; Android's repackaged OkHttp strips Authorization on cross-authority redirects but retains these nonstandard headers, disclosing a complete configured API key or token to another authority. The additional exposure applies when redirect or front-door behavior is compromised separately from the credential-handling component, or those components operate in different trust domains; a completely malicious initial origin already receives the credential on the first request. Autonomous clients require no human action, while user-invoked workflows can require interaction. Explicit followRedirects(false) prevents the redirected request. The demonstrated impact is credential disclosure, not subsequent credential use, integrity or availability impact, code execution, or host compromise. This issue is fixed in version 1.3.2.Final.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
不充分的凭证保护机制
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, < 1.3.2.Final | - |
|
二、漏洞 CVE-2026-111765 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-111765 其他参考 (7)
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https://github.com/a2aproject/a2a-java/pull/1141 x_refsource_MISC
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https://github.com/a2aproject/a2a-java/releases/tag/v1.3.2.Final x_refsource_MISC
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https://github.com/a2aproject/a2a-java/security/advisories/GHSA-4fpj-g9jf-9rgg x_refsource_CONFIRM
同批安全公告 · a2aproject · 2026-10-20 · 共 5 条
| CVE-2026-111764 | 7.5 HIGH | A2A Java SDK 任务授权默认开放漏洞 |
| CVE-2026-111761 | 5.8 MEDIUM | A2A Java SDK 推送通知 SSRF 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-2026-111765
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