What is CVE-2026-54117?

CVE-2026-54117 is a critical-severity vulnerability in Microsoft SQL Server 2025 (Cu 6), classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-07-14.

How severe is CVE-2026-54117?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Microsoft SQL Server 2025 (Cu 6)

CVE-2026-54117

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

Vulnerability class: Insecure Deserialization

EPSS: 0.012 (64.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Microsoft Sql Server 2025 (Cu 6) — versions 17.0.4060.2
Microsoft Sql Server 2025 For X64-based Systems (Gdr) — versions 17.0.1050.2
Microsoft Sql_server_2016
Microsoft Sql_server_2017
Microsoft Sql_server_2019
Microsoft Sql_server_2022
Microsoft Sql_server_2025

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

Microsoft SQL Server Remote Code Execution Vulnerability (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-54117?: CVE-2026-54117 is a critical-severity vulnerability in Microsoft SQL Server 2025 (Cu 6), classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-07-14.
How severe is CVE-2026-54117?: Critical severity. CVSS v3 base score is 9.8 out of 10.