Heap-Based Buffer Overflow in Microsoft SQL Server by Microsoft
CVE-2026-67638

8.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft Sql Server 2025 (cu8)
Microsoft Sql Server 2025 For X64-based Systems (gdr)
Vendor
CVE Published:
8 September 2026

What is CVE-2026-67638?

A heap-based buffer overflow vulnerability exists in Microsoft SQL Server, allowing an authorized attacker to execute arbitrary code over a network. This security flaw may be exploited to manipulate system operations, potentially granting the attacker control over affected instances of SQL Server. Timely patching is essential to mitigate the risks associated with this vulnerability.

Affected Version(s)

Microsoft SQL Server 2025 (CU8) x64-based Systems 17.0.0.0 < 17.0.4085.5

Microsoft SQL Server 2025 for x64-based Systems (GDR) x64-based Systems 17.0.1050.2 < 17.0.1135.8

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

.