CVE-2026-85886: 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 execute code over a network.
CVSS v3.1
Score 8.5high
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 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 is a heap-based buffer overflow in Microsoft SQL Server 2017 (GDR) and related versions, which allows an attacker with low privileges to execute arbitrary code remotely over a network. The flaw is identified as CWE-122. Multiple version ranges across SQL Server 2017, 2019, 2022, and 2024 branches are affected. The vulnerability has been assigned CVE-2026-85886 and has a CVSS 3.1 base score of 8.5, indicating high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
An attacker who is authorized with low privileges can exploit this vulnerability remotely to execute arbitrary code on the affected SQL Server instance. This can lead to full compromise of the database server, affecting confidentiality, integrity, and availability of data and services.
Mitigation Recommendations
Microsoft has released official patches to fix this vulnerability. It is recommended to apply the updates provided by Microsoft for the affected versions of SQL Server 2017 and later. No additional mitigation actions are specified beyond applying the official fix.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-04T18:18:19.327Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85886","vendor":"Microsoft"}]
Threat ID: 6ace99952cdf04f656ad11dd
Added to database: 10/13/2026, 20:50:29 UTC
Last enriched: 10/13/2026, 21:03:56 UTC
Last updated: 10/14/2026, 00:08:20 UTC
Views: 5
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