CVE-2026-111764: A2A Java SDK has a fail-open default task authorization
With the SDK’s default configuration, task reads are not authorized: any caller can retrieve a task (including its status, context, message history, and artifacts) created by another caller, by supplying the task id.
References
- github.com/a2aproject/a2a-java/commit/efb4e985e99390c4fc1f78c0a187a4254c0a2553
- github.com/a2aproject/a2a-java/pull/1095
- github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final
- github.com/a2aproject/a2a-java/security/advisories/GHSA-qw47-mcm5-934w
- github.com/advisories/GHSA-qw47-mcm5-934w
- nvd.nist.gov/vuln/detail/CVE-2026-111764
Code Behaviors & Features
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