A2A Java SDK send client credentials under server-controlled HTTP header name, enabling leakage via redirect

Impact. A malicious or compromised A2A agent can cause the client's API key credential to be forwarded to an arbitrary third-party server. The agent serves an AgentCard with an APIKeySecurityScheme specifying a custom header name, then responds with an HTTP redirect. The JDK HttpClient follows th...

GHSA-9RHM-2H4X-JWMX A2A Java SDK send client credentials under server-controlled HTTP header name, enabling leakage via redirect

Impact. A malicious or compromised A2A agent can cause the client's API key credential to be forwarded to an arbitrary third-party server. The agent serves an AgentCard with an APIKeySecurityScheme specifying a custom header name, then responds with an HTTP redirect. The JDK HttpClient follows th...

CVE-2026-111763

The A2A Java SDK (prior to version 1.3.0.Final ) is vulnerable to credential leakage via HTTP redirects. The AuthInterceptor.intercept component in client/transport/spi/src/main/java/org/a2aproject/sdk/client/transport/spi/interceptors/auth/AuthInterceptor.java uses the APIKeySecurityScheme.name(...

CVE-2026-111763 A2A Java SDK send client credentials under server-controlled HTTP header name, enabling leakage via redirect

A2A Java SDK is the official Java SDK for the Agent2Agent A2A Protocol. Prior to 1.3.0.Final, a malicious or compromised remote agent can cause the default JDK-based client to forward a configured API key to a third-party server. When a client application configures credentials through...