CVE-2026-77481: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft SQL Server 2017 (CU 31)
Description
Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.
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 (CVE-2026-77481) is a heap-based buffer overflow in Microsoft SQL Server 2017 (CU 31) and related versions. It enables an attacker with authorized access to execute arbitrary code remotely over the network. The flaw is classified under CWE-122 (Heap-based Buffer Overflow). The CVSS v3.1 score is 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix addressing this issue.
Potential Impact
An authorized attacker can exploit this vulnerability remotely to execute arbitrary code on the affected SQL Server instance. This could lead to full compromise of the server, including data theft, data manipulation, or denial of service. The vulnerability affects confidentiality, integrity, and availability of the system.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the security updates provided by Microsoft for the affected versions of SQL Server as soon as possible. Refer to the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77481 for detailed patch information and update instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-20T20:11:33.672Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77481","vendor":"Microsoft"}]
Threat ID: 6aa04556acd9273b49fa9eb7
Added to database: 09/08/2026, 17:26:46 UTC
Last enriched: 10/14/2026, 21:55:49 UTC
Last updated: 10/21/2026, 13:40:30 UTC
Views: 26
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