CVE-2026-78456: SQL Server Remote Code Execution Vulnerability
Published Sep 8, 2026
·Updated
Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.
Other sources
SQL Server Remote Code Execution Vulnerability
— Microsoft
Affected Software
4 affected componentsFixes available
Microsoft SQL Server 2022<16.0.1200.5
16.0.1200.5
Microsoft SQL Server 2022 (CU 26)<16.0.4275.2
16.0.4275.2
Microsoft SQL Server 2022<16.0.1200.5
Microsoft SQL Server 2022>=16.0.4003.1<16.0.4275.2
Remediation
Event History
Sep 8, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·05:18 PM
Data Sourced
via MITRE·05:18 PM
DescriptionSeverity
Data Sourced
via NVD·06:20 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What level of access does an attacker need to exploit this vulnerability?
The attacker must be authorized and able to reach the affected SQL Server over the network. No user interaction is required.
2
What is the potential impact if exploitation succeeds?
Successful exploitation can allow remote code execution. The provided severity vector indicates high impacts to confidentiality, integrity, and availability.
3
Which SQL Server releases are identified as affected?
The provided data identifies Microsoft SQL Server 2022 and Microsoft SQL Server 2022 CU 26. No information is provided about other versions, default configurations, mitigations, or detection methods.