CVE-2026-77810: Code Injection via Gremlin Query Passthrough in Amazon Athena Neptune Connector

Severity: critical (CVSS 9.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-21 · updated 2026-10-12
Weakness: CWE-95

Description

In the Neptune connector, a user with access to Neptune through Athena Federated Query could gain access to properties in the Lambda supplying the compute for the connector. To remediate this issue, users should upgrade to aws-athena-query-federation v2026.30.1 or later.

Affected products

AWS Athena Federated Query Neptune Connector: from 2024.15.1 through 2026.28.1

References

https://aws.amazon.com/security/security-bulletins/2026-087-aws/
https://github.com/awslabs/aws-athena-query-federation/releases/tag/v2026.30.1
https://github.com/awslabs/aws-athena-query-federation/security/advisories/GHSA-v7c2-5wfg-qg44

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