Microsoft SQL Server: Information disclosure through buffer over-read
Summary
Several supported builds of Microsoft SQL Server 2017, 2019, 2022 and 2025 contain a buffer over-read (CWE-126). An unauthenticated attacker with network access to the server can read memory contents and may obtain sensitive data such as query data or credentials. The impact is limited to confidentiality; integrity and availability are not affected, and Microsoft has released fixed builds.
Affected
- SQL Server 2017 (GDR): 14.0.0 to before 14.0.2150.2
- SQL Server 2017 for x64-based Systems (CU31): 14.0.3006.16 to before 14.0.3570.2
- SQL Server 2019 (GDR): 15.0.0 to before 15.0.2210.4
- SQL Server 2019 for x64-based Systems (CU32): 15.0.4003.23 to before 15.0.4510.2
- SQL Server 2022 (GDR): 16.0.0 to before 16.0.1220.3
- SQL Server 2022 for x64-based Systems (CU27): 16.0.4003.1 to before 16.0.4315.2
- SQL Server 2025 CU10: 17.0.4006.0 to before 17.0.5045.3
- SQL Server 2025 for x64-based Systems (GDR): 17.0.1050.2 to before 17.0.1155.3
Fixed in
- SQL Server 2017 (GDR): 14.0.2150.2
- SQL Server 2017 for x64-based Systems (CU31): 14.0.3570.2
- SQL Server 2019 (GDR): 15.0.2210.4
- SQL Server 2019 for x64-based Systems (CU32): 15.0.4510.2
- SQL Server 2022 (GDR): 16.0.1220.3
- SQL Server 2022 for x64-based Systems (CU27): 16.0.4315.2
- SQL Server 2025 CU10: 17.0.5045.3
- SQL Server 2025 for x64-based Systems (GDR): 17.0.1155.3
Verify exact builds on the MSRC advisory before rollout.
Workaround
Unknown. No specific workaround has been published for this CVE. Applying the Microsoft security update is the fix.
- As general hardening, restrict which networks can reach the SQL Server port and disable unused network protocols.
Exploitation
- No exploitation in the wild or public proof of concept found at the time of writing.
- CISA SSVC: Exploitation none, Automatable yes, Technical Impact partial.
- Rapid7 rates exploitation as less likely.
- CISA KEV membership not verified.
Our recommendation
- Inventory all SQL Server instances and their exact build numbers.
- Install the November 2026 Microsoft security update for your branch (KB5132748 for SQL Server 2025 GDR; verify other KB numbers on MSRC).
- Prioritise instances that are reachable from the internet, partner networks or misconfigured VPNs.
- Restrict network access to the SQL Server port and monitor for unusual connections.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE Record CVE-2026-116943 www.cve.org
- Microsoft Security Update Guide (MSRC) msrc.microsoft.com
- Microsoft KB5132748 (SQL Server 2025 GDR, November 2026) support.microsoft.com
- Rapid7 Patch Tuesday November 2026 www.rapid7.com
- Strix CVE mirror CVE-2026-116943 www.strix.ai
- ThreatInt CVE mirror CVE-2026-116943 cve.threatint.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 05:42.
Original description (NVD)
Buffer over-read in SQL Server allows an unauthorized attacker to disclose information over a network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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