CVE-2026-90820
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk14th percentile - higher than 14% of all known CVEs
Summary
A vulnerability has been detected in a2aproject a2a-java 1.2.0, in the function AuthorizationRequestHandlerDecorator.onListTasks, leading to missing authorization. The attack can be launched remotely. Upgrading to version 1.3.0 resolves the issue.
Risk Assessment
An attacker may access task lists without proper authorization, potentially compromising data confidentiality.
Recommendation
Upgrade the component to version 1.3.0 or later, which includes the fix.
Other vulnerabilities in a2a-java
See all- CVE-2026-117507Medium
A security vulnerability has been detected in a2aproject a2a-java up to 1.2.0.Final. This impacts the function TaskManager.saveTaskEvent. The manipulation leads to a race condition. The attack may be initiated remotely. Upgrading to version 1.3.0.Final fixes this issue (patch identifier: 6b8e1e085c35e970ef0048901cd25850e4791ec2).
- CVE-2026-117506Medium
A weakness has been identified in a2aproject a2a-java up to 1.2.0.Final. This affects the function InMemoryPushNotificationConfigStore.setInfo of the file extras/push-notification-config-store-database-jpa/src/main/java/org/a2aproject/sdk/extras/pushnotificationconfigstore/database/jpa/JpaDatabasePushNotificationConfigStore.java of the component Push Notification Config Store. Manipulation can lead to resource consumption. The attack can be launched remotely. Upgrading to version 1.3.0.Final mitigates this issue (patch: b478810a03b4a16841d36aca5c6e87d8f48fce67).
- CVE-2026-117505Medium
A security flaw has been discovered in a2aproject a2a-java up to 1.2.0.Final. The impacted element is the function queue.offer of the component ChildQueue. Manipulation results in resource consumption. The attack can be initiated remotely. Upgrading to version 1.3.0.Final is sufficient to resolve this issue (patch: be663f806efcfdddd2805d214fae4998379ac5f2).
- CVE-2026-116479Medium
A flaw was found in a2a-java up to 1.2.0.Final affecting the getMessage function of the JSON-RPC Error Handler component. The manipulation causes information exposure through error messages. The attack can be launched remotely, and upgrading to version 1.3.0.Final fixes the issue.
- CVE-2026-90819High
A weakness has been identified in a2aproject a2a-java 1.2.0. The affected element is the function BasePushNotificationSender.dispatchNotification of the file server-common/src/main/java/org/a2aproject/sdk/server/tasks/BasePushNotificationSender.java of the component Authorization Header Construction. This manipulation causes http response splitting. The attack can be initiated remotely. Upgrading to version 1.3.0 is sufficient to fix this issue. Patch name: 247a655043f145f6f8e3853724b6a543eaa02001. You should upgrade the affected component.
Original NVD description (English source)
A security vulnerability has been detected in a2aproject a2a-java 1.2.0. The impacted element is the function AuthorizationRequestHandlerDecorator.onListTasks of the file server-common/src/main/java/org/a2aproject/sdk/server/requesthandlers/AuthorizationRequestHandlerDecorator.java. Such manipulation leads to missing authorization. The attack can be launched remotely. Upgrading to version 1.3.0 is sufficient to resolve this issue. The name of the patch is e9a1abf9c90c02b16d17293afdc3cc2f555d63a6. The affected component should be upgraded.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS