CVE-2026-88085: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft SQL Server 2017 (GDR)
Description
Heap-based buffer overflow in SQL Server allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 6.4medium
Affected software
Microsoft
Microsoft SQL Server 2017 (GDR)
Microsoft
Microsoft SQL Server 2017 for x64-based Systems (CU31)
Microsoft
Microsoft SQL Server 2019 (GDR)
Microsoft
Microsoft SQL Server 2019 for x64-based Systems (CU32)
Microsoft
Microsoft SQL Server 2022 (GDR)
Microsoft
Microsoft SQL Server 2022 for x64-based Systems (CU27)
Microsoft
Microsoft SQL Server 2025 (CU8)
Microsoft
Microsoft SQL Server 2025 for x64-based Systems (CU9)
Microsoft
Microsoft SQL Server 2025 for x64-based Systems (GDR)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a heap-based buffer overflow in Microsoft SQL Server 2017 (GDR) and later versions, which can be exploited by an authorized attacker with local access to elevate their privileges. The flaw is identified as CWE-122. The CVSS v3.1 base score is 6.4, indicating a medium severity with high impact on confidentiality, integrity, and availability. The attack vector requires local access with high privileges and no user interaction. Multiple version ranges across SQL Server 2017, 2019, 2022, and later are affected, with official patches available from Microsoft.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges on the affected system, potentially leading to full control over the SQL Server instance and impacting confidentiality, integrity, and availability of data and services.
Mitigation Recommendations
Microsoft has released official fixes for this vulnerability. It is recommended to apply the security updates provided by Microsoft as detailed in their advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88085. No additional mitigation steps are indicated beyond applying the official patches.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-09T21:47:30.203Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88085","vendor":"Microsoft"}]
Threat ID: 6ace9d332cdf04f656af1da1
Added to database: 10/13/2026, 21:05:55 UTC
Last enriched: 10/13/2026, 21:19:02 UTC
Last updated: 10/13/2026, 22:50:43 UTC
Views: 8
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