CVE-2026-67643

Heap-based buffer overflow in SQL Server allows an unauthorized attacker to execute code over a network.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67643	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:microsoft:sql_server_2022:::::::x64:*
	cpe:2.3:a:microsoft:sql_server_2022:::::::x64:*
	cpe:2.3:a:microsoft:sql_server_2025:::::::x64:*
	cpe:2.3:a:microsoft:sql_server_2025:::::::x64:*

History

17 Sep 2026, 20:17

Type	Values Removed	Values Added
References	~~() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67643 - Vendor Advisory, Patch~~	() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67643 - Patch, Vendor Advisory
CVSS	v2 : ~~unknown~~ v3 : ~~8.8~~	v2 : unknown v3 : 9.8
Summary	~~(en) Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.~~	(en) Heap-based buffer overflow in SQL Server allows an unauthorized attacker to execute code over a network.

Information

Published : 2026-09-08 18:18

Updated : 2026-09-17 20:17

NVD link : CVE-2026-67643

Mitre link : CVE-2026-67643

CVE.ORG link : CVE-2026-67643

JSON object : View

Products Affected

microsoft

sql_server_2022
sql_server_2025

CWE

CWE-122

Heap-based Buffer Overflow

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