What is CVE-2026-78456?

CVE-2026-78456 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. SQL Server Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-78456 cover?

CVE-2026-78456 covers the following CVE IDs: CVE-2026-78456. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-78456?

CVE-2026-78456 has a CVSS v3 base score of 8.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-78456?

CVE-2026-78456 affects 2 products, including: Microsoft SQL Server 2022 for x64-based Systems (CU 26); Microsoft SQL Server 2022 for x64-based Systems (GDR).

CVE-2026-78456HighCVSS 8.8

SQL Server Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

September 11, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-78456 →

📋 Description

Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.

🎯 Affected products2

Microsoft SQL Server 2022 for x64-based Systems (CU 26)
Microsoft SQL Server 2022 for x64-based Systems (GDR)

✅ Remediation

KB5122768 (Security Update) — fixed build 16.0.4275.2 KB5122771 (Security Update) — fixed build 16.0.1200.5

🔗 References (5)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78456
patchhttps://www.microsoft.com/download/details.aspx?familyid=d682ec86-56e1-45c3-a0fa-552f89f6e51e
referencehttps://support.microsoft.com/help/5122768
patchhttps://www.microsoft.com/download/details.aspx?familyid=7ce0ba48-9a1e-4298-b300-79f251385092
referencehttps://support.microsoft.com/help/5122771