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TI-2026-73665 Aliases CVE-2026-94520

Format string flaw in Microsoft SQL Server allows denial of service

Priority LOW 24CWE-134Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-134 and the CVSS impact.

Summary

Microsoft SQL Server 2017, 2019, 2022 and 2025 builds are affected, each from its listed version before the fixed version. Use of an externally-controlled format string (CWE-134) lets an authorized attacker with high privileges cause a denial of service over the network.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Use of externally-controlled format string in SQL Server allows an authorized attacker to deny service over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00844 58th percentileScored 2026-11-07
Fix Fixed Microsoft SQL Server 2017 (GDR) (Microsoft): 14.0.2140.2Microsoft SQL Server 2017 for x64-based Systems (CU31) (Microsoft): 14.0.3560.2+6 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft SQL Server 2017 (GDR)14.0.0 to before 14.0.2140.214.0.2140.2Patch availableCNA
MicrosoftMicrosoft SQL Server 2017 for x64-based Systems (CU31)14.0.3006.16 to before 14.0.3560.214.0.3560.2Patch availableCNA
MicrosoftMicrosoft SQL Server 2019 (GDR)15.0.0 to before 15.0.2200.215.0.2200.2Patch availableCNA
MicrosoftMicrosoft SQL Server 2019 for x64-based Systems (CU32)15.0.4003.23 to before 15.0.4500.215.0.4500.2Patch availableCNA
MicrosoftMicrosoft SQL Server 2022 (GDR)16.0.0 to before 16.0.1210.316.0.1210.3Patch availableCNA
MicrosoftMicrosoft SQL Server 2022 for x64-based Systems (CU27)16.0.4003.1 to before 16.0.4305.516.0.4305.5Patch availableCNA
MicrosoftMicrosoft SQL Server 2025 for x64-based Systems (CU9)17.0.4006.2 to before 17.0.5015.417.0.5015.4Patch availableCNA
MicrosoftMicrosoft SQL Server 2025 for x64-based Systems (GDR)17.0.1050.2 to before 17.0.1145.417.0.1145.4Patch availableCNA
  • Microsoft SQL Server 2017 (GDR) VendorMicrosoft Affected 14.0.0 to before 14.0.2140.2 Fixed in 14.0.2140.2 Patch available CNA
  • Microsoft SQL Server 2017 for x64-based Systems (CU31) VendorMicrosoft Affected 14.0.3006.16 to before 14.0.3560.2 Fixed in 14.0.3560.2 Patch available CNA
  • Microsoft SQL Server 2019 (GDR) VendorMicrosoft Affected 15.0.0 to before 15.0.2200.2 Fixed in 15.0.2200.2 Patch available CNA
  • Microsoft SQL Server 2019 for x64-based Systems (CU32) VendorMicrosoft Affected 15.0.4003.23 to before 15.0.4500.2 Fixed in 15.0.4500.2 Patch available CNA
  • Microsoft SQL Server 2022 (GDR) VendorMicrosoft Affected 16.0.0 to before 16.0.1210.3 Fixed in 16.0.1210.3 Patch available CNA
  • Microsoft SQL Server 2022 for x64-based Systems (CU27) VendorMicrosoft Affected 16.0.4003.1 to before 16.0.4305.5 Fixed in 16.0.4305.5 Patch available CNA
  • Microsoft SQL Server 2025 for x64-based Systems (CU9) VendorMicrosoft Affected 17.0.4006.2 to before 17.0.5015.4 Fixed in 17.0.5015.4 Patch available CNA
  • Microsoft SQL Server 2025 for x64-based Systems (GDR) VendorMicrosoft Affected 17.0.1050.2 to before 17.0.1145.4 Fixed in 17.0.1145.4 Patch available CNA

Remediation

Apply the fixed version for each affected build: SQL Server 2017 (GDR) 14.0.2140.2, SQL Server 2017 for x64-based Systems (CU31) 14.0.3560.2, SQL Server 2019 (GDR) 15.0.2200.2, SQL Server 2019 for x64-based Systems (CU32) 15.0.4500.2, SQL Server 2022 (GDR) 16.0.1210.3, SQL Server 2022 for x64-based Systems (CU27) 16.0.4305.5, SQL Server 2025 for x64-based Systems (CU9) 17.0.5015.4, and SQL Server 2025 for x64-based Systems (GDR) 17.0.1145.4.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Microsoft SQL Server 2017 (GDR) (Microsoft) Fixed in 14.0.2140.2
  • Fix · CNA Microsoft SQL Server 2017 for x64-based Systems (CU31) (Microsoft) Fixed in 14.0.3560.2
  • Fix · CNA Microsoft SQL Server 2019 (GDR) (Microsoft) Fixed in 15.0.2200.2
  • Fix · CNA Microsoft SQL Server 2019 for x64-based Systems (CU32) (Microsoft) Fixed in 15.0.4500.2
  • Fix · CNA Microsoft SQL Server 2022 (GDR) (Microsoft) Fixed in 16.0.1210.3
  • Fix · CNA Microsoft SQL Server 2022 for x64-based Systems (CU27) (Microsoft) Fixed in 16.0.4305.5
  • Fix · CNA Microsoft SQL Server 2025 for x64-based Systems (CU9) (Microsoft) Fixed in 17.0.5015.4
  • Fix · CNA Microsoft SQL Server 2025 for x64-based Systems (GDR) (Microsoft) Fixed in 17.0.1145.4

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-94520
  2. 2026-10-25 EPSS moved to the 50th–90th percentile

References

Patch 1

  • TI-2026-42212 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-37256 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-16982 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-36863 Windows Server Update Service (WSUS) Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-33671 Microsoft SharePoint Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
See all 18045 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences