Vulnerability · Published Oct 13, 2026 · Assigned by microsoft
CVE-2026-94520Microsoft SQL Server Denial of Service Vulnerability
Medium 4.9
In plain English
A medium-severity security flaw in Microsoft SQL Server 2017 for x64-based Systems (CU31) from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities).
Severity (CVSS 3.1)4.9Medium
Exploit odds (30 days)0.8%top 41.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Use of externally-controlled format string in SQL Server allows an authorized attacker to deny service over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft SQL Server 2017 (GDR) | 14.0.0 – before 14.0.2140.2 |
| Microsoft | Microsoft SQL Server 2017 for x64-based Systems (CU31) | 14.0.3006.16 – before 14.0.3560.2 |
| Microsoft | Microsoft SQL Server 2019 (GDR) | 15.0.0 – before 15.0.2200.2 |
| Microsoft | Microsoft SQL Server 2019 for x64-based Systems (CU32) | 15.0.4003.23 – before 15.0.4500.2 |
| Microsoft | Microsoft SQL Server 2022 (GDR) | 16.0.0 – before 16.0.1210.3 |
| Microsoft | Microsoft SQL Server 2022 for x64-based Systems (CU27) | 16.0.4003.1 – before 16.0.4305.5 |
| Microsoft | Microsoft SQL Server 2025 for x64-based Systems (CU9) | 17.0.4006.2 – before 17.0.5015.4 |
| Microsoft | Microsoft SQL Server 2025 for x64-based Systems (GDR) | 17.0.1050.2 – before 17.0.1145.4 |
Weakness: CWE-134 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
References
- Microsoft SQL Server Denial of Service Vulnerability vendor-advisory, patch