CVE-2026-77810 AWS CVE debrief

Who should care

Users of the Neptune connector through Athena Federated Query, administrators of AWS environments, and security teams responsible for monitoring and mitigating vulnerabilities should be aware of this critical vulnerability. The affected operators include users of the Neptune connector, and the platform impact is high. The vulnerability-management impact is also high, as users need to verify their configurations and upgrade to the latest version of aws-athena-query-federation. Security teams should review compensating controls for exposed systems while remediation is scheduled and verified.

Technical summary

The Neptune connector vulnerability, CVE-2026-77810, allows users with access to Neptune through Athena Federated Query to gain unauthorized access to properties in the Lambda supplying the compute for the connector. This critical vulnerability has a CVSS score of 9.4 and requires immediate attention. The affected product is the Neptune connector, and the defensive impact is high. The source-grounded technical framing indicates that the vulnerability is related to the Neptune connector's interaction with Athena Federated Query. To mitigate this issue, users should upgrade to aws-athena-query-federation v2026.30.1 or later and verify their configurations for potential unauthorized access.

Defensive priority

Users of the Neptune connector through Athena Federated Query should verify their configurations and upgrade to aws-athena-query-federation v2026.30.1 or later to mitigate potential unauthorized access.

Recommended defensive actions

• Upgrade to aws-athena-query-federation v2026.30.1 or later
• Verify configurations for potential unauthorized access
• Monitor for suspicious activity
• 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.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE-2026-77810 record indicates a critical vulnerability in the Neptune connector, allowing users with access to Neptune through Athena Federated Query to gain unauthorized access to properties in the Lambda supplying the compute for the connector. The vendor, Amazon, has provided a remediation by upgrading to aws-athena-query-federation v2026.30.1 or later.

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.