AIKIDO-2026-279806
@google/adk is vulnerable to Missing Authentication
75
High Risk
This Affects:
@google/adkTL;DR
The toA2a utility mounts an Agent-to-Agent server that exposes an agent and its tools over REST and JSON-RPC. Before the fix, both handlers default to no authentication, so a mounted A2A server is reachable by any network caller without credentials. This lets unauthenticated callers invoke the agent and its tools. The fix makes toA2a fail closed by requiring an explicit authentication user builder, and only permits unauthenticated access when allowUnauthenticated is deliberately set for local development.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you mount an Agent-to-Agent server with toA2a without configuring authentication.
Background info
@google/adk is vulnerable to Missing Authentication in versions 0.6.0 - 1.4.0.
How to fix this
Upgrade the @google/adk library to the patch version.
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