CVE-2026-54117: Microsoft SQL Server Remote Code Execution Vulnerability

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-14 · updated 2026-10-28
Weakness: CWE-502

Description

Deserialization of untrusted data in SQL Server allows an unauthorized attacker to execute code over a network.

Affected products

Microsoft Sql Server 2016: from 13.0.6300.2 before 13.0.6500.1; from 13.0.7000.253 before 13.0.7095.1 — fixed in 13.0.6500.1, 13.0.7095.1
Microsoft Sql Server 2017: from 14.0.1000.169 before 14.0.2120.1; from 14.0.3006.16 before 14.0.3540.1 — fixed in 14.0.2120.1, 14.0.3540.1
Microsoft Sql Server 2019: from 15.0.2000.5 before 15.0.2180.2; from 15.0.4003.23 before 15.0.4480.2 — fixed in 15.0.2180.2, 15.0.4480.2
Microsoft Sql Server 2022: from 16.0.1000.6 before 16.0.1190.2; from 16.0.4003.1 before 16.0.4262.2 — fixed in 16.0.1190.2, 16.0.4262.2
Microsoft Sql Server 2025: from 17.0.1000.7 before 17.0.1125.2; from 17.0.4006.2 before 17.0.4060.2 — fixed in 17.0.1125.2, 17.0.4060.2
Microsoft SQL Server 2025 (CU 6): from 17.0.4060.2 before 17.0.4060.2 — fixed in 17.0.4060.2
Microsoft SQL Server 2025 for x64-based Systems (GDR): from 17.0.1050.2 before 17.0.1125.2 — fixed in 17.0.1125.2

How to fix

Upgrade to a fixed version: Microsoft Sql Server 2016 13.0.6500.1, 13.0.7095.1; Microsoft Sql Server 2017 14.0.2120.1, 14.0.3540.1; Microsoft Sql Server 2019 15.0.2180.2, 15.0.4480.2; Microsoft Sql Server 2022 16.0.1190.2, 16.0.4262.2; Microsoft Sql Server 2025 17.0.1125.2, 17.0.4060.2; Microsoft SQL Server 2025 (CU 6) 17.0.4060.2; Microsoft SQL Server 2025 for x64-based Systems (GDR) 17.0.1125.2. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54117

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