CVE-2026-67380: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft SQL Server 2017 (CU 31)
Description
CVE-2026-67380 is a heap-based buffer overflow vulnerability in Microsoft SQL Server 2017 (CU 31) that allows an authorized attacker to execute code remotely over a network. The vulnerability affects multiple versions of SQL Server 2017, 2019, 2022, and 2024 builds prior to specific fixed versions. It has a high severity with a CVSS score of 8.8. An official fix is available from Microsoft.
CVSS v3.1
Score 8.8high
Affected software
Microsoft
Microsoft SQL Server 2017 (CU 31)
Microsoft
Microsoft SQL Server 2017 (GDR)
Microsoft
Microsoft SQL Server 2019 (CU 32)
Microsoft
Microsoft SQL Server 2019 (GDR)
Microsoft
Microsoft SQL Server 2022 (CU 26)
Microsoft
Microsoft SQL Server 2022 (GDR)
Microsoft
Microsoft SQL Server 2025 (CU8)
Microsoft
Microsoft SQL Server 2025 for x64-based Systems (GDR)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-122) involves a heap-based buffer overflow in Microsoft SQL Server 2017 and later versions up to certain cumulative updates. An attacker with authorized access can exploit this flaw to execute arbitrary code remotely over the network. The vulnerability has been assigned CVE-2026-67380 and carries a CVSS 3.1 base score of 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released official patches to address this issue.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely on the affected SQL Server instance, potentially leading to full compromise of the database server. The vulnerability impacts confidentiality, integrity, and availability of the system.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the security updates provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67380 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-29T14:57:03.841Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67380","vendor":"Microsoft"}]
Threat ID: 6aa044cbacd9273b49fa7b54
Added to database: 09/08/2026, 17:24:27 UTC
Last enriched: 10/16/2026, 20:50:47 UTC
Last updated: 10/22/2026, 01:15:25 UTC
Views: 26
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