Description
Integer underflow (wrap or wraparound) in SQL Server allows an authorized attacker to disclose information locally.
Published: 2026-09-08
Score: 5.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Information Disclosure
Action: Assess Impact
AI Analysis

Impact

The vulnerability is an integer underflow that can be triggered by an authorized local user and allows the disclosure of sensitive data from Microsoft SQL Server. The weakness is categorized as CWE-191 and results in accidental exposure of information that should be protected, rather than facilitating code execution or other destructive actions.

Affected Systems

Microsoft SQL Server 2017 – cumulative update 31 and GDR releases, Microsoft SQL Server 2019 – cumulative update 32 and GDR releases, Microsoft SQL Server 2022 – cumulative update 26 and GDR releases, and Microsoft SQL Server 2025 – cumulative update 8 and GDR releases for x64-based systems.

Risk and Exploitability

The CVSS score of 5.5 indicates a moderate severity scenario focused on information disclosure. EPSS data is not provided, and the issue is not listed in the CISA KEV catalog, suggesting low public exploitation risk. The flaw can only be exploited by a user who already has local administrative or authorized access to the SQL Server instance, so it does not enable remote or privilege-escalating attacks.

Generated by OpenCVE AI on September 9, 2026 at 01:31 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the latest cumulative update or service pack from Microsoft that contains the fix for CVE-2026-77488.
  • Ensure SQL Server instances operate under the principle of least privilege and limit local administrative access.
  • Configure audit logging to track unauthorized data access attempts and monitor these logs for suspicious activity.

Generated by OpenCVE AI on September 9, 2026 at 01:31 UTC.

Tracking

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Advisories

No advisories yet.

History

Tue, 15 Sep 2026 15:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:microsoft:sql_server_2017:*:*:*:*:*:*:x64:*

Thu, 10 Sep 2026 05:45:00 +0000

Type Values Removed Values Added
First Time appeared 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)
Vendors & Products 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)

Tue, 08 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 08 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Description Integer underflow (wrap or wraparound) in SQL Server allows an authorized attacker to disclose information locally.
Title Microsoft SQL Server Information Disclosure Vulnerability
First Time appeared Microsoft
Microsoft sql Server 2017
Microsoft sql Server 2019
Microsoft sql Server 2022
Microsoft sql Server 2025
Weaknesses CWE-191
CPEs cpe:2.3:a:microsoft:sql_server_2017:*:-:*:*:*:*:x64:*
cpe:2.3:a:microsoft:sql_server_2019:*:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:sql_server_2022:*:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:sql_server_2025:*:*:*:*:*:*:x64:*
Vendors & Products Microsoft
Microsoft sql Server 2017
Microsoft sql Server 2019
Microsoft sql Server 2022
Microsoft sql Server 2025
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C'}


Subscriptions

Microsoft Microsoft Sql Server 2017 (cu 31) Microsoft Sql Server 2017 (gdr) Microsoft Sql Server 2019 (cu 32) Microsoft Sql Server 2019 (gdr) Microsoft Sql Server 2022 (cu 26) Microsoft Sql Server 2022 (gdr) Microsoft Sql Server 2025 (cu8) Microsoft Sql Server 2025 For X64-based Systems (gdr) Sql Server 2017 Sql Server 2019 Sql Server 2022 Sql Server 2025
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-09-25T21:38:03.128Z

Reserved: 2026-08-20T20:11:33.672Z

Link: CVE-2026-77488

cve-icon Vulnrichment

Updated: 2026-09-08T20:04:32.439Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-08T18:20:34.527

Modified: 2026-09-15T14:57:29.537

Link: CVE-2026-77488

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-10T05:30:16Z

Weaknesses
  • CWE-191

    Integer Underflow (Wrap or Wraparound)