CVE-2026-111765
HighCVSS 7.5Summary
A2A Java SDK from 1.3.0.Final before 1.3.2.Final: the AndroidA2AHttpClient synchronous POST path overrides the disabled-redirect setting with PostBuilder's followRedirects=true. JSONRPCTransport and RestTransport add interceptor-produced authentication headers and call synchronous post() without disabling redirects, disclosing a configured API key or token to another authority on redirect.
Risk Assessment
A configured API key or token may be disclosed to another authority, enabling unauthorized access to protected resources.
Recommendation
Upgrade A2A Java SDK to version 1.3.2.Final, which fixes this issue.
Other vulnerabilities in A2A Java SDK
See all- CVE-2026-111764High
A2A Java SDK prior to 1.3.0.Final: the default InMemoryTaskStore configuration performs no authorization on task reads. The no-argument constructor sets authorizationProvider to null, and get(String taskId) returns the stored task without checking caller or owner. In a multi-caller deployment, a caller who knows another caller's task ID can retrieve task status, context ID, message history, and artifacts; default transport endpoints do not enforce authentication.
- CVE-2026-111763Medium
A2A Java SDK prior to 1.3.0.Final allows a malicious or compromised remote agent to cause the default JDK-based client to forward a configured API key to a third-party server. AuthInterceptor uses APIKeySecurityScheme.name() from the remote AgentCard as the HTTP header name without checking that the declared location is HEADER, and JdkA2AHttpClient uses followRedirects(NORMAL), so an agent-controlled cross-origin redirect forwards the credential-bearing header.
- CVE-2026-111762Medium
A2A Java SDK before 1.3.0.Final has a vulnerability in RestHandler.parseRequestBody that logs the entire JSON request body at SEVERE level when protobuf parsing fails. With push notifications enabled, this can expose tokens and authentication credentials in server logs.
- CVE-2026-111761Medium
A2A Java SDK before 1.3.0.Final has a vulnerability in BasePushNotificationSender that sends task data to a URL without destination validation, scheme restrictions, or redirect limits. An unauthenticated attacker can register an arbitrary destination, causing the server to send requests to internal or local resources.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS