CVE-2026-78441: Windows OLE DB Information Disclosure Vulnerability

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-08 · updated 2026-10-31
Weakness: CWE-125

Description

Out-of-bounds read in Windows OLE DB allows an unauthorized attacker to disclose information over a network.

Affected products

Microsoft Sql Server 2017: before 14.0.2130.4; from 14.0.3006.16 before 14.0.3550.4 — fixed in 14.0.2130.4, 14.0.3550.4
Microsoft Sql Server 2019: before 15.0.2190.7; from 15.0.4003.23 through 15.0.4490.9 — fixed in 15.0.2190.7
Microsoft SQL Server 2017 (CU 31): from 14.0.0 before 14.0.3550.4 — fixed in 14.0.3550.4
Microsoft SQL Server 2017 (GDR): from 14.0.0 before 14.0.2130.4 — fixed in 14.0.2130.4
Microsoft SQL Server 2019 (CU 32): from 15.0.0.0 before 15.0.4490.9 — fixed in 15.0.4490.9
Microsoft SQL Server 2019 (GDR): from 15.0.0 before 15.0.2190.7 — fixed in 15.0.2190.7

How to fix

Upgrade to a fixed version: Microsoft Sql Server 2017 14.0.2130.4, 14.0.3550.4; Microsoft Sql Server 2019 15.0.2190.7; Microsoft SQL Server 2017 (CU 31) 14.0.3550.4; Microsoft SQL Server 2017 (GDR) 14.0.2130.4; Microsoft SQL Server 2019 (CU 32) 15.0.4490.9; Microsoft SQL Server 2019 (GDR) 15.0.2190.7. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78441

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