Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Unlikely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An authenticated attacker could exploit this vulnerability by connecting to an affected SQL Server and submitting a specially crafted query or request that triggers a memory corruption condition, allowing the attacker to execute code on the server. Authentication is required; user interaction is not required.
Security updates
17.0.1135.8 — https://support.microsoft.com/help/5122770
17.0.4085.5 — https://support.microsoft.com/help/5122769
Vulnerabilities 1
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High 8.8
Microsoft SQL Server Remote Code Execution Vulnerability
Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.
Revision history
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#1
Information published.
References
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CVE-2026-67638 Microsoft SQL Server Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67638
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss