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CVE-2026-67380 Microsoft CVE debrief

CVE-2026-67380 is a heap-based buffer overflow vulnerability in Microsoft SQL Server that allows an authorized attacker to execute code over a network. The vulnerability has a CVSS score of 8.8 and is considered HIGH severity. Microsoft has provided a patch for this vulnerability, and defenders should prioritize applying this patch to prevent exploitation.

Vendor
Microsoft
Product
Microsoft SQL Server 2017 (CU 31)
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-16
Advisory published
2026-09-08
Advisory updated
2026-09-16

Who should care

Defenders responsible for SQL Server configurations and security, including operators, platform administrators, and vulnerability management teams, should prioritize applying the patch to prevent exploitation and potential code execution over a network.

Why it matters

CVE-2026-67380 is a high-severity vulnerability in Microsoft SQL Server that requires immediate attention from defenders. The vulnerability allows an authorized attacker to execute code over a network, and Microsoft has provided a patch to prevent exploitation. Defenders responsible for SQL Server configurations and security should prioritize applying this patch to prevent potential code execution and other operational impacts.

  • Potential code execution over a network
  • High severity vulnerability with CVSS score of 8.8

Technical summary

The vulnerability is a heap-based buffer overflow in Microsoft SQL Server that allows an authorized attacker to execute code over a network. The vulnerability has a CVSS score of 8.8 and is considered HIGH severity. It affects Microsoft SQL Server deployments, and defenders should focus on patching and reviewing configurations to prevent exploitation and potential code execution.

Defensive priority

Apply patch immediately

Recommended defensive actions

  • Apply patch immediately
  • Review and update SQL Server configurations
  • Monitor for suspicious activity

Evidence notes

The vulnerability is described in the CVE record and NVD vulnerability detail page. Microsoft has provided a patch for this vulnerability. Evidence is limited to public CVE details and NVD vulnerability assessment. Defenders should verify patch application and review SQL Server configurations for potential exposure.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-67380 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-67380

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

  • CVE-2026-67380 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-67380

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

Supplemental references

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.