CVE-2026-116479 a2aproject CVE debrief

Who should care

Defenders responsible for a2aproject a2a-java deployments should assess exposure and prioritize upgrading to version 1.3.0.Final to mitigate information exposure. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review and update inventory to ensure affected versions are identified and verify potential information exposure through error messages.

Why it matters

CVE-2026-116479 is a medium-severity vulnerability in a2aproject a2a-java that can lead to information exposure through error messages. Defenders should prioritize upgrading to version 1.3.0.Final and monitor for potential information exposure.

• Potential information exposure through error messages
• Need to verify affected versions and scope
• Priority on upgrading to version 1.3.0.Final
• Monitoring for potential information exposure

Technical summary

The a2aproject a2a-java component up to version 1.2.0.Final contains a flaw in its JSON-RPC Error Handler, leading to information exposure through error messages. This vulnerability can be exploited remotely. Defenders should prioritize upgrading to version 1.3.0.Final to mitigate information exposure through error messages. The vulnerability has a CVSS score of 5.3 and a medium severity level. Affected product context and defensive impact should be considered when assessing exposure and planning remediation efforts.

Defensive priority

Defenders should prioritize upgrading to version 1.3.0.Final to mitigate information exposure through error messages.

Recommended defensive actions

• Upgrade to version 1.3.0.Final
• Review and update inventory to ensure affected versions are identified
• Monitor for potential information exposure through error messages
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but further verification is needed to confirm affected versions and scope. Affected product deployments need to be identified and verified for potential information exposure through error messages. Defenders should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.