CVE-2026-77488: CWE-191: Integer Underflow (Wrap or Wraparound) in Microsoft Microsoft SQL Server 2017 (CU 31)
Description
Integer underflow (wrap or wraparound) in SQL Server allows an authorized attacker to disclose information locally.
CVSS v3.1
Score 5.5medium
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-2026-77488) is an integer underflow (wrap or wraparound) issue in Microsoft SQL Server 2017 (CU 31). It allows an attacker with authorized local access and low privileges to cause an integer underflow condition, which can lead to information disclosure. The vulnerability affects multiple versions of SQL Server 2017 and later branches as specified. Microsoft has released an official fix addressing this issue.
Potential Impact
An authorized attacker with local access and low privileges can exploit this integer underflow vulnerability to disclose sensitive information. The vulnerability does not impact integrity or availability but compromises confidentiality.
Mitigation Recommendations
Microsoft has provided an official fix for this vulnerability. Users should apply the vendor's patch as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77488 to remediate the issue.
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-2026-77488","vendor":"Microsoft"}]
Threat ID: 6aa04556acd9273b49fa9ec5
Added to database: 09/08/2026, 17:26:46 UTC
Last enriched: 10/14/2026, 21:56:22 UTC
Last updated: 10/22/2026, 01:15:26 UTC
Views: 34
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