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 attacker needs a valid SQL login with low privileges (PR:L) but no user interaction. Microsoft rates the flaw CVSS 8.8 with high impact on confidentiality, integrity and availability.
Affected
- 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 CU31 (x64): 14.0.3570.2
- SQL Server 2019 GDR: 15.0.2210.4
- SQL Server 2019 CU32 (x64): 15.0.4510.2
- SQL Server 2022 GDR: 16.0.1220.3
- SQL Server 2022 CU27 (x64): 16.0.4315.2
- SQL Server 2025 CU10: 17.0.5045.3
- SQL Server 2025 GDR (x64): 17.1155.3
- KB numbers: Unknown. Check the MSRC advisory for your branch.
Workaround
Unknown. No vendor workaround was identified. Apply the security update.
Exploitation
- Exploited in the wild: Unknown for this CVE. CISA SSVC rates exploitation as none.
- Public proof of concept: None found.
- CISA KEV: Not listed in the sources reviewed.
Our recommendation
- Inventory all SQL Server instances and their builds, including GDR and CU branches.
- Install the fixed builds listed above, using the KB for your branch from the MSRC advisory.
- Confirm that no SQL Server instance is reachable from the internet, DMZ or untrusted networks.
- Review SQL logins and remove unused or excessive privileges.
- Prioritise patching if an instance is internet-facing or runs unpatched 2017 or 2019 builds.
- Recheck CISA KEV and NVD once analysis is published.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- MSRC Security Update Guide msrc.microsoft.com
- CVE.org CVE Record www.cve.org
- Threatint CVE details cve.threatint.com
- Strix CVE-2026-116942 www.strix.ai
- Trinetriops November 2026 Patch Tuesday trinetriops.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 10 Nov 2026, 22:34.
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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