CVE-2026-111764
HighCVSS 7.5Summary
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.
Risk Assessment
An unauthenticated caller can read other users' task data, compromising information confidentiality.
Recommendation
Upgrade A2A Java SDK to version 1.3.0.Final, which fixes this issue.
Other vulnerabilities in A2A Java SDK
See all- CVE-2026-111765High
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.
- 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. 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 InMemoryTaskStore.get(String taskId) returns the stored task without checking the caller or owner. Authorization depends on supplying a TaskAuthorizationProvider and routing requests through AuthorizationRequestHandlerDecorator, whether installed through CDI or explicitly by the application. Default store wiring and manually constructed DefaultRequestHandler.builder().build() handlers, including integrations such as Spring, leave task reads unprotected when no effective authorization-provider and decorator check is installed. In a multi-caller deployment using the default configuration, a caller who knows or guesses another caller's task ID can retrieve the task status, context ID, message history, and artifacts. The default/reference transport endpoints do not enforce authentication, so the task-read disclosure is reachable by an unauthenticated caller rather than requiring a privileged account. This issue is fixed in version 1.3.0.Final.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS