Patch tracker / KB5089271
KB5089271: SQL Server 2016 Security Update (May 2026)
KB5089271 is a High security update for SQL Server 2016, released 2026-05-12. It closes 1 CVE with a maximum CVSS of 8.8. Microsoft documents 1 known issue for this update, quoted below.
Before you deploy: Microsoft lists 1 known issue for this update.
Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date. If you are unsure, check the linked source before you act, and tell us when we are wrong so we can fix it.
Update summary
Fixes 1 CVE. Most severe CVSS 8.8 (High). EPSS exploit probability up to <1%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.
A newer security update for Microsoft SQL Server 2016 for x64-based Systems Service Pack 3 (GDR) has shipped since this one: KB5102340 (2026-07-14). For cumulative update families the newer package includes these fixes, so installing that one is usually the shorter path. Verify against your own update rings before you skip this package.
Microsoft documents 1 known issue with this update.
- Linked server queries that use MSDASQL fail with error 7416
KB5089271 patches a single flaw (CVE-2026-40370) across a wide SQL Server range, from the older 2017 GDR through 2022 CU24 and the new 2025 CU4, rated High severity at CVSS 8.8. Exposure spans any x64 SQL Server host still on these branches, though the 1 percent EPSS and absence from CISA KEV suggest exploitation is not yet observed in the wild.
Do this: Identify which SQL Server branch each instance runs and apply the matching build (2025 CU4, 2022 CU24, or 2017 GDR) from KB5089271, prioritizing internet-reachable or business-critical databases.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5089271
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5089271
- Released
- 2026-05-12
- Last changed
- 2026-09-26
- Changes tracked
- 2
Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.
Check if KB5089271 is installed
Elevated PowerShell. No output means it is not installed.
Known issues, from Microsoft
Quoted from Microsoft's support article for KB5089271 (checked 2026-08-06). Microsoft lists 1 known issue. Verify against the article before acting.
Linked server queries that use MSDASQL fail with error 7416
Linked server queries that use the MSDASQL (OLE DB Provider for ODBC Drivers) provider and specify a provider string (@ provstr ) fail and return the following error message:
Msg 7416, Level 16
Access to the remote server is denied because no login-mapping exists.
A stricter connection validation check in the Database Engine can reject connections for certain linked server configurations that use the MSDASQL provider, even if earlier builds allowed those connections.
For more information and workarounds, see Linked server queries that use MSDASQL fail with error 7416.
CVEs fixed by this update
Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2026-40370 | High | 8.8 | <1% | No |
Scope and sources
- Affected products
- Also released in May 2026
KB5002863
9 CVEs · High · exploitedKB5002868
9 CVEs · High · exploitedKB5002870
9 CVEs · High · exploitedKB5094139
1 CVE · High · exploitedKB5094140
1 CVE · High · exploitedKB5094142
1 CVE · High · exploitedKB5094144
1 CVE · High · exploitedKB5078943
3 CVEs · CriticalThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.