What is CVE-2026-78442?

CVE-2026-78442 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Windows OLE DB Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-78442 cover?

CVE-2026-78442 covers the following CVE IDs: CVE-2026-78442. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-78442?

CVE-2026-78442 has a CVSS v3 base score of 8.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-78442?

CVE-2026-78442 affects 4 products, including: Microsoft SQL Server 2017 for x64-based Systems (CU 31); Microsoft SQL Server 2017 for x64-based Systems (GDR); Microsoft SQL Server 2019 for x64-based Systems (CU 32); Microsoft SQL Server 2019 for x64-based Systems (GDR).

CVE-2026-78442HighCVSS 8.8

Windows OLE DB 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-2026-78442 →

📋 Description

Heap-based buffer overflow in Windows OLE DB allows an unauthorized attacker to execute code over a network.

🎯 Affected products4

Microsoft SQL Server 2017 for x64-based Systems (CU 31)
Microsoft SQL Server 2017 for x64-based Systems (GDR)
Microsoft SQL Server 2019 for x64-based Systems (CU 32)
Microsoft SQL Server 2019 for x64-based Systems (GDR)

✅ Remediation

KB5122775 (Security Update) — fixed build 14.0.2130.4 KB5122773 (Security Update) — fixed build 15.0.2190.7 KB5122774 (Security Update) — fixed build 14.0.3550.4 KB5122772 (Security Update) — fixed build 15.0.4490.9

🔗 References (9)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78442
patchhttps://www.microsoft.com/download/details.aspx?familyid=bd775fa7-3414-4aeb-9309-4e0b90d4d1ee
referencehttps://support.microsoft.com/help/5122775
patchhttps://www.microsoft.com/download/details.aspx?familyid=e668fe5f-ea1e-41fb-97f7-1bc12e91150b
referencehttps://support.microsoft.com/help/5122773
patchhttps://www.microsoft.com/download/details.aspx?familyid=a2440065-e61a-43ec-96a2-a5ee18f7fc19
referencehttps://support.microsoft.com/help/5122774
patchhttps://www.microsoft.com/download/details.aspx?familyid=cee52a4a-832a-447e-909d-0f629cab835f
referencehttps://support.microsoft.com/help/5122772