AWS Athena Synapse Connector Flaw May Return Unintended Data
A vulnerability in the AWS Athena Federated Query Synapse Connector could cause unintended data returns when querying specially crafted table names.
Key points
- CVE-2026-12283 affects AWS Athena Query Federation versions v2022.20.1 through v2026.19.1.
- Users with Azure Synapse access can create tables with crafted names that trigger the issue.
- AWS released version v2026.21.1 to address the vulnerability.
An attacker with access to an Azure Synapse account could potentially cause unintended data to be returned through the AWS Athena Synapse connector. This occurs when the attacker creates a table with a specially crafted name and queries it via the connector. The issue requires valid credentials for the Azure Synapse environment to initiate. No confirmation exists that this flaw has been exploited in the wild.
How it unfolded
- AWS Security Bulletins published advisory 2026-059-AWS on July 17, 2026.
- The bulletin identified CVE-2026-12283 in the Athena Federated Query Synapse Connector.
- AWS released version v2026.21.1 to address the issue.
Who is affected
Organizations using AWS Athena Query Federation versions v2022.20.1 through v2026.19.1 are affected. The flaw impacts the Synapse connector specifically. Any user who has permission to create tables in an Azure Synapse account connected to Athena is at risk. This includes environments where table creation is automated or programmatic.
The fix
AWS released version v2026.21.1 of the Athena Query Federation to fix the issue. The vendor recommends upgrading to this latest version immediately. Users running forked or derivative code must patch their implementations to incorporate the new fixes. AWS also advises verifying that no vulnerable tables currently exist in Synapse databases.
What made it possible
This vulnerability stems from insufficient input validation during table name processing. Attackers exploit this by injecting crafted strings that alter query behavior. It serves as an initial access or data exfiltration technique. Teams usually monitor for anomalous query patterns from connectors. Check whether your environment allows unvalidated input in table metadata. Ensure that connector configurations enforce strict naming conventions to prevent such manipulation.
What to do and how to stay safe: AWS
- Upgrade to AWS Athena Query Federation version v2026.21.1 or later.
- Audit existing Azure Synapse tables for names containing special characters or unexpected formats.
- Implement input sanitization for any programmatic table creation processes.
- Monitor Athena query logs for unusual data retrieval patterns from Synapse sources.
Step-by-step guide: What Is Virtual Patching: How It Works Without Code Changes
General security guidance from the RedTeam Tribune newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
Which AWS service is affected by CVE-2026-12283?
The AWS Athena Federated Query Synapse Connector is affected.
What versions of the connector contain the flaw?
Versions greater than or equal to v2022.20.1 and less than or equal to v2026.19.1 are affected.
Is there a confirmed patch for this vulnerability?
Yes, AWS released version v2026.21.1 to address the issue.
