CVE-2026-111762 A2A Java SDK: Push notification credentials logged in cleartext on protobuf parse failure

What is CVE-2026-111762?

CVE-2026-111762 is a medium-severity vulnerability in a2aproject a2a-java, published on 20 Oct 2026.

Official description

A2A Java SDK is the official Java SDK for the Agent2Agent (A2A) Protocol. Prior to 1.3.0.Final, RestHandler.parseRequestBody in `transport/rest/src/main/java/org/a2aproject/sdk/transport/rest/handler/RestHandler.java` logs the entire JSON request body at SEVERE level when JsonFormat.parser().merge() throws InvalidProtocolBufferException. With push notifications enabled, createTaskPushNotificationConfiguration reaches this parser for requests to `/v1/tenants/{tenant}/tasks/{taskId}/pushNotificationConfigs`, whose token and authentication.credentials fields can contain bearer tokens and authentication credentials for client push endpoints. A valid JSON body that fails protobuf deserialization, including an unknown field under strict parsing or a schema mismatch, causes those secrets to be written to the server logs in cleartext. An attacker with access to the server logs or a log aggregation system can retrieve the credentials and potentially use the credentials to send forged task status updates to the client's push notification endpoint. This issue is fixed in version 1.3.0.Final.

Weakness: CWE-532

Which versions are affected by CVE-2026-111762?

2 open source packages ship an affected version, including org.a2aproject.sdk:a2a-java-sdk-transport-rest.

How do I fix CVE-2026-111762?

Upgrade org.a2aproject.sdk:a2a-java-sdk-transport-rest to 1.3.0.Final or later.

Is CVE-2026-111762 being exploited?

There is no known exploitation of CVE-2026-111762 in the wild and no public exploit code.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-x32g-jvvm-4725.