CVE-2026-77482: Microsoft SQL Server Remote Code Execution Vulnerability

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-08 · updated 2026-10-26
Weakness: CWE-122

Description

Heap-based buffer overflow in SQL Server allows an unauthorized attacker to execute code 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 before 15.0.4490.9 — fixed in 15.0.2190.7, 15.0.4490.9
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, 15.0.4490.9; 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-2026-77482

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