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CVE-2026-83945 Microsoft CVE debrief

Microsoft SQL Server Remote Code Execution Vulnerability allows an authorized attacker to execute code over a network due to a heap-based buffer overflow. This vulnerability affects Microsoft SQL Server 2022 (GDR), Microsoft SQL Server 2022 for x64-based Systems (CU27), Microsoft SQL Server 2025 (CU8), Microsoft SQL Server 2025 for x64-based Systems (CU9), and Microsoft SQL Server 2025 for x64-based Systems (GDR). Defenders should prioritize verifying exposure and applying patches for affected versions. The vulnerability is a heap-based buffer overflow in Microsoft SQL Server, which allows an authorized attacker to execute code over a network.

Vendor
Microsoft
Product
Microsoft SQL Server 2022 (GDR)
CVSS
MEDIUM 6.6
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 Microsoft SQL Server deployments should assess exposure and apply patches. This includes administrators and security teams managing SQL Server infrastructure.

Why it matters

CVE-2026-83945 is a remote code execution vulnerability in Microsoft SQL Server that allows an authorized attacker to execute code over a network. Defenders should prioritize verifying exposure and applying patches for affected versions.

  • Verify exposure of Microsoft SQL Server deployments to this vulnerability
  • Apply patches or compensating controls to prevent exploitation
  • Monitor for suspicious activity related to SQL Server
  • Review network configurations to limit access to SQL Server

Technical summary

The vulnerability is a heap-based buffer overflow in Microsoft SQL Server, which allows an authorized attacker to execute code over a network. Affected products include Microsoft SQL Server 2022 (GDR), Microsoft SQL Server 2022 for x64-based Systems (CU27), Microsoft SQL Server 2025 (CU8), Microsoft SQL Server 2025 for x64-based Systems (CU9), and Microsoft SQL Server 2025 for x64-based Systems (GDR).

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Microsoft SQL Server 2022 (GDR), Microsoft SQL Server 2022 for x64-based Systems (CU27), Microsoft SQL Server 2025 (CU8), Microsoft SQL Server 2025 for x64-based Systems (CU9), and Microsoft SQL Server 2025 for x64-based Systems (GDR).

Recommended defensive actions

  • Verify exposure of Microsoft SQL Server 2022 (GDR), Microsoft SQL Server 2022 for x64-based Systems (CU27), Microsoft SQL Server 2025 (CU8), Microsoft SQL Server 2025 for x64-based Systems (CU9), and Microsoft SQL Server
  • Apply patches from Microsoft for affected versions
  • Review network configurations to limit access to SQL Server
  • Monitor for suspicious activity related to SQL Server

Evidence notes

The CVE record and source item provide details on the vulnerability, affected products, and references to vendor advisories. The vulnerability has been publicly disclosed and patches are available from Microsoft. Defenders should verify exposure of Microsoft SQL Server deployments to this vulnerability and apply patches or compensating controls to prevent exploitation. The CVE Program record (cve-org) and NIST NVD detail page (nvd) provide additional information on the vulnerability. A

Sources and references

Verified primary and authoritative sources

  • CVE-2026-83945 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-83945

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

  • CVE-2026-83945 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-83945

    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/2026/83xxx/CVE-2026-83945.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83945

    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.