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CVE-2026-88089 Microsoft CVE debrief

Microsoft SQL Server Remote Code Execution Vulnerability. A heap-based buffer overflow in Microsoft SQL Server allows an authorized attacker to execute code locally. The vulnerability affects multiple versions of SQL Server, including 2017, 2019, 2022, and 2025. SQL Server administrators and security teams should assess exposure, apply patches, and verify local access controls to prevent unauthorized elevation. This medium-severity vulnerability requires immediate attention to prevent potential local code execution, privilege escalation, and data tampering.

Vendor
Microsoft
Product
Microsoft SQL Server 2017 (GDR)
CVSS
MEDIUM 6.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-14
Advisory published
2026-10-13
Advisory updated
2026-10-14

Who should care

SQL Server administrators, security teams, and IT personnel responsible for managing SQL Server deployments should assess exposure and apply patches. Local access controls should be verified to prevent unauthorized elevation. Operators, platform administrators, and vulnerability management teams must prioritize patching and compensating controls for exposed systems.

Why it matters

CVE-2026-88089 is a medium-severity vulnerability in Microsoft SQL Server that allows authorized attackers to execute code locally. SQL Server administrators and security teams should assess exposure, apply patches, and verify local access controls to prevent unauthorized elevation.

  • Local code execution by authorized attackers.
  • Potential elevation of privileges.
  • Data tampering and unauthorized access.

Technical summary

A heap-based buffer overflow in Microsoft SQL Server allows an authorized attacker to execute code locally. The vulnerability affects multiple versions of SQL Server, including 2017, 2019, 2022, and 2025. Microsoft has released patches for affected versions.

Defensive priority

Medium

Recommended defensive actions

  • Review and apply patches from Microsoft for affected SQL Server versions.
  • Inventory SQL Server deployments to identify affected versions.
  • Verify local access controls to prevent unauthorized elevation.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record and source item provide details on a heap-based buffer overflow in SQL Server, allowing an authorized attacker to execute code locally. Affected versions and patches are specified in the source item.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-88089 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-88089

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-88089 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-88089

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Microsoft SQL Server Remote Code Execution Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/88xxx/CVE-2026-88089.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88089

    Supplemental source - vendor-advisory, patch

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.