Microsoft Security Response CenterCVE-2026-54118

Microsoft SQL Server Remote Code Execution Vulnerability

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

Read the vendor bulletin Get alerts for Microsoft SQL Server 2016 for x64-based Systems Service Pack 3 Azure Connect Feature Pack

9.8CVSS out of 10Critical severity

Scope

What the vendor says is affected

Microsoft SQL Server 2016 for x64-based Systems Service Pack 3 Azure Connect Feature Pack
Microsoft SQL Server 2019 for x64-based Systems (GDR)
Microsoft SQL Server 2022 for x64-based Systems (GDR)
Microsoft SQL Server 2017 for x64-based Systems (CU 31)
Microsoft SQL Server 2019 for x64-based Systems (CU 32)
Microsoft SQL Server 2022 for x64-based Systems (CU 25)
Microsoft SQL Server 2025 for x64-based Systems (GDR)
Microsoft SQL Server 2025 for x64-based Systems (CU6)
Microsoft SQL Server 2016 for x64-based Systems Service Pack 3 (GDR)
Microsoft SQL Server 2017 for x64-based Systems (GDR)

Versions the vendor lists as fixed

13.0.7095.1
15.0.2180.2
16.0.1190.2
14.0.3540.1
15.0.4480.2
16.0.4262.2
17.0.1125.2
17.0.4060.2
13.0.6500.1
14.0.2120.1

Next step

What the vendor recommends

Install KB5102339. Install KB5102336. Install KB5102334. Install KB5102337. Install KB5102335. Install KB5101347. Install KB5102333. Install KB5101346. Install KB5102340. Install KB5102338.

Review the complete instructions on the vendor's site

Timeline

When this advisory changed

Jul 14, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Aug 20, 2026 at 7:00 AM UTC
Updated by Microsoft Security Response Center
The vendor changed the advisory after it was first published.
Sep 28, 2026 at 11:20 AM UTC
Added to SecurityAlert
We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-54118View CVSS, KEV, EPSS, and threat context

Source

Start with the vendor's bulletin

SecurityAlert organizes the fields the vendor published. The original bulletin remains the source of record for affected versions, fixes, and later changes.

Vendor: Microsoft Security Response Center
Advisory ID: CVE-2026-54118
Last source check: Sep 28, 2026 at 11:20 AM UTC

Open the official bulletin How SecurityAlert builds this record

Your environment

Check the systems you actually run

A vendor advisory can tell you what may be affected. It cannot tell you whether that product and version are installed in your environment.

Confirm the product and installed version.
Read the vendor's prerequisites and exceptions.
Test the update or mitigation through your normal change process.

Watch Microsoft SQL Server 2016 for x64-based Systems Service Pack 3 Azure Connect Feature Pack

Keep following

Get new Microsoft Security Response Center advisories

Use the vendor-specific RSS feed or set up alerts for a product your team relies on.

Follow this vendor's RSS feed

What the vendor says is affected

Versions the vendor lists as fixed

What the vendor recommends

When this advisory changed

CVEs named in this advisory

Related advisories from Microsoft Security Response Center

drm/i915: Fix memory leak in query_perf_config_list()

s390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap

wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi

drm/amd/pm: bound pp_dpm_set_pp_table() memcpy

wifi: mac80211: ibss: wait for in-flight TX on disconnect

SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry