Microsoft SQL Server: Heap-based buffer overflow allows remote code execution
Summary
A heap-based buffer overflow in Microsoft SQL Server allows an authorized attacker to execute code over the network. The CVSS vector requires high attack complexity and low privileges, so the attacker needs a valid database or login account. CISA SSVC rates exploitation as none and automatable as no, and no public proof of concept was found.
Affected
- SQL Server 2017 (GDR): 14.0.0 to < 14.0.2150.2
- SQL Server 2017 for x64-based Systems (CU31): 14.0.3006.16 to < 14.0.3570.2
- SQL Server 2019 (GDR): 15.0.0 to < 15.0.2210.4
- SQL Server 2019 for x64-based Systems (CU32): 15.0.4003.23 to < 15.0.4510.2
- SQL Server 2022 (GDR): 16.0.0 to < 16.0.1220.3
- SQL Server 2022 for x64-based Systems (CU27): 16.0.4003.1 to < 16.0.4315.2
- SQL Server 2025 CU10: 17.0.4006.0 to < 17.0.5045.3
- SQL Server 2025 for x64-based Systems (GDR): 17.0.1050.2 to < 17.0.1155.3
Note: the affected ranges are taken from the official CVE record. Third-party sources disagree on some lower bounds, so verify them against MSRC.
Fixed in
Unknown. The fixed builds could not be confirmed from the MSRC advisory. Check the MSRC Security Update Guide for the fixed build of each branch.
Workaround
Unknown. No vendor workaround is documented in the sources reviewed. The security update is the primary remediation.
Exploitation
- Exploited in the wild: No evidence found.
- Public proof of concept: None found.
- CISA SSVC: Exploitation none, automatable no, technical impact total.
Our recommendation
- Inventory all SQL Server instances and their exact builds.
- Compare each build with the MSRC advisory and apply the fixed build for its branch.
- Verify that no SQL Server instance (including port 1433 and SQL Browser) is reachable from the internet.
- Review accounts that can authenticate to SQL Server, remove unused ones, and enforce strong passwords and MFA where supported.
- Prioritize instances used by many staff or by applications with shared service accounts.
- Monitor for unusual database logins or crashes after patching.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-116947 msrc.microsoft.com
- CVE.org record: CVE-2026-116947 www.cve.org
- Strix: CVE-2026-116947 www.strix.ai
- Threatint: CVE-2026-116947 cve.threatint.com
- Microsoft KB5132748 (SQL Server 2025 GDR, November 2026) support.microsoft.com
- Rapid7: Patch Tuesday November 2026 www.rapid7.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, 05:40.
Original description (NVD)
Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code 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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