CVE-2026-94520: CWE-134: Use of Externally-Controlled Format String in Microsoft Microsoft SQL Server 2017 (GDR)
Description
Use of externally-controlled format string in SQL Server allows an authorized attacker to deny service over a network.
CVSS v3.1
Score 4.9medium
Affected software
Microsoft
Microsoft SQL Server 2017 (GDR)
Microsoft
Microsoft SQL Server 2017 for x64-based Systems (CU31)
Microsoft
Microsoft SQL Server 2019 (GDR)
Microsoft
Microsoft SQL Server 2019 for x64-based Systems (CU32)
Microsoft
Microsoft SQL Server 2022 (GDR)
Microsoft
Microsoft SQL Server 2022 for x64-based Systems (CU27)
Microsoft
Microsoft SQL Server 2025 for x64-based Systems (CU9)
Microsoft
Microsoft SQL Server 2025 for x64-based Systems (GDR)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-94520) in Microsoft SQL Server 2017 (GDR) is due to the use of an externally-controlled format string, classified under CWE-134. An authorized attacker can exploit this flaw to cause a denial of service condition remotely. The vulnerability affects multiple versions of SQL Server 2017 and later, as specified by the affected version ranges. Microsoft has released official fixes to remediate this issue.
Potential Impact
An authorized attacker can exploit this vulnerability to cause denial of service (DoS) on the affected Microsoft SQL Server instances over the network. There is no impact on confidentiality or integrity reported. No known exploits are currently observed in the wild.
Mitigation Recommendations
Microsoft has released official patches to fix this vulnerability. It is recommended to apply the provided updates to affected versions of Microsoft SQL Server 2017 (GDR) and later as soon as possible to mitigate the risk of denial of service attacks.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-21T18:23:52.967Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-94520","vendor":"Microsoft"}]
Threat ID: 6ace9d332cdf04f656af1da6
Added to database: 10/13/2026, 21:05:55 UTC
Last enriched: 10/13/2026, 21:18:48 UTC
Last updated: 10/13/2026, 22:05:40 UTC
Views: 5
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