CVE-2026-56642: Microsoft Fabric Data Warehouse Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Unlikely

Patch Tuesday

2026-Jul

Released

2026-07-14

Last Updated

2026-08-18

EPSS Score

0.91% (percentile: 57.0%)

Description

Stack-based buffer overflow in Microsoft Fabric Data Warehouse allows an authorized attacker to execute code over a network.

FAQ

Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability? This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency. Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.

Affected Products (1)

SQL Server

• Fabric Data Warehouse

Acknowledgments

Microsoft Red Team

Revision History

• 2026-07-14: Information published.
• 2026-08-18: Updated the Security Updates table by removing an affected software entry. No user action is required. This is an informational change only.