CVE-2026-94520ImportantDoSNetwork
Microsoft SQL Server Denial of Service Vulnerability
Assessment
Use of externally-controlled format string in SQL Server allows an authorized attacker to deny service over a network.
- Severity
- Important
- CVSS base score
- 4.9CVSS:3.1/
AV:N/ AC:L/ PR:H/ UI:N/ S:U/ C:N/ I:N/ A:H/ E:U/ RL:O/ RC:C - Impact
- Denial of Service
- EPSS, next 30 days
- Not scored yet
- Public exploit code
- No Nuclei template lists it
- Exploitability
- Exploitation Unlikely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- SQL Server
- Weakness
- CWE-134: Use of Externally-Controlled Format String
- Issued by
- Microsoft
- Published
- 13 Oct 2026 · October 2026
- Last revised
- 13 Oct 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
- Attack vector
- NetworkAV:N
- Attack complexity
- LowAC:L
- Privileges required
- HighPR:H
- User interaction
- NoneUI:N
- Scope
- UnchangedS:U
- Confidentiality
- NoneC:N
- Integrity
- NoneI:N
- Availability
- HighA:H
Updates that fix it
8 KBs| KB | Type | Restart | Applies to | Other CVEs |
|---|---|---|---|---|
| KB5126934 | Security Update | Required | Microsoft SQL Server 2022 for x64-based Systems (CU27) | All CVEs in KB5126934 |
| KB5126967 | Security Update | Required | Microsoft SQL Server 2025 for x64-based Systems (CU9) | All CVEs in KB5126967 |
| KB5128492 | Security Update | Required | Microsoft SQL Server 2025 for x64-based Systems (GDR) | All CVEs in KB5128492 |
| KB5128493 | Security Update | Required | Microsoft SQL Server 2022 for x64-based Systems (GDR) | All CVEs in KB5128493 |
| KB5128494 | Security Update | Required | Microsoft SQL Server 2019 for x64-based Systems (CU32) | All CVEs in KB5128494 |
| KB5128495 | Security Update | Required | Microsoft SQL Server 2019 for x64-based Systems (GDR) | All CVEs in KB5128495 |
| KB5128496 | Security Update | Required | Microsoft SQL Server 2017 for x64-based Systems (CU31) | All CVEs in KB5128496 |
| KB5128497 | Security Update | Required | Microsoft SQL Server 2017 for x64-based Systems (GDR) | All CVEs in KB5128497 |
What changed
First observed 14 Oct 2026No field changes in the recorded history.
Cite this recorded revision to keep the same title, summary, facts and links when the page changes.
A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.