Heap-Based Buffer Overflow in SQL Server by Microsoft
CVE-2026-78456

8.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft Sql Server 2022 (cu 26)
Microsoft Sql Server 2022 (gdr)
Vendor
CVE Published:
8 September 2026

What is CVE-2026-78456?

A heap-based buffer overflow vulnerability exists in SQL Server, enabling an authorized attacker to execute arbitrary code remotely through the network. This flaw arises when processing certain data inputs, leading to potential exploitation if not mitigated. It is crucial for users and administrators to apply the latest patches to safeguard their systems against potential attacks that leverage this vulnerability.

Affected Version(s)

Microsoft SQL Server 2022 (CU 26) x64-based Systems 16.0.0.0 < 16.0.4275.2

Microsoft SQL Server 2022 (GDR) x64-based Systems 16.0.0 < 16.0.1200.5

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.