Heap-based Buffer Overflow Vulnerability in Microsoft SQL Server
CVE-2026-67642

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-2026-67642?

A critical vulnerability exists in Microsoft SQL Server, allowing an authorized attacker to initiate a heap-based buffer overflow. Successful exploitation could enable the attacker to execute arbitrary code remotely, compromising the integrity and confidentiality of the affected systems. This vulnerability underscores the importance of timely patching and network security measures.

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

.