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CVE-2026-65674 Microsoft CVE debrief

Microsoft SQL Server Remote Code Execution Vulnerability allows an authorized attacker to execute code over a network due to deserialization of untrusted data. Affected versions include Microsoft SQL Server 2019 (GDR), 2019 for x64-based Systems (CU32), 2022 (GDR), 2022 for x64-based Systems (CU27), 2025 for x64-based Systems (CU9), and 2025 for x64-based Systems (GDR).

Vendor
Microsoft
Product
Microsoft SQL Server 2019 (GDR)
CVSS
HIGH 8.8
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

Defenders responsible for SQL Server deployments, particularly those managing affected versions, should assess exposure and prioritize patching. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify and mitigate potential impacts on their systems.

Why it matters

CVE-2026-65674 allows authorized attackers to execute code over a network. Defenders should prioritize patching, restrict access, and monitor activity.

  • Verify and patch affected SQL Server versions to prevent code execution
  • Restrict network access to SQL Server instances
  • Monitor for suspicious activity related to deserialization

Technical summary

The vulnerability allows an authorized attacker to execute code over a network due to deserialization of untrusted data in SQL Server. Affected versions include Microsoft SQL Server 2019 (GDR) < 15.0.2200.2, 2019 for x64-based Systems (CU32) < 15.0.4500.2, 2022 (GDR) < 16.0.1210.3, 2022 for x64-based Systems (CU27) < 16.0.4305.5, 2025 for x64-based Systems (CU9) < 17.0.5015.4, and 2025 for x64-based Systems (GDR) < 17.0.1145.4.

Defensive priority

Defenders should prioritize patching affected SQL Server versions and verify network exposure.

Recommended defensive actions

  • Patch affected Microsoft SQL Server versions
  • Verify network exposure and restrict access
  • Monitor for suspicious activity

Evidence notes

The CVE record and source item provide details on affected versions and vendor advisories. Affected versions include Microsoft SQL Server 2019 (GDR), 2019 for x64-based Systems (CU32), 2022 (GDR), 2022 for x64-based Systems (CU27), 2025 for x64-based Systems (CU9), and 2025 for x64-based Systems (GDR). Defenders should verify these versions and patch accordingly. Evidence is limited to public CVE and source item details, with explicit verification tasks recommended for defenders.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-65674 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-65674

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

  • CVE-2026-65674 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-65674

    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/2026/65xxx/CVE-2026-65674.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65674

    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.