Microsoft WDAC OLE DB provider for SQL: Remote code execution via use-after-free

Summary

A use-after-free memory corruption flaw (CWE-416) in the Microsoft WDAC OLE DB provider for SQL on Windows allows remote code execution. An unauthenticated attacker can attempt this over a network, but the attack has high complexity and requires user interaction, for example opening or visiting attacker-controlled content. The CVSS 3.1 base score is 7.5 (High). CISA SSVC lists exploitation as none and automatable as no.

Affected

• Windows 10 Version 1607 (10.0.14393.0 to before 10.0.14393.9688)
• Windows 10 Version 1809 (10.0.17763.0 to before 10.0.17763.9487)
• Windows 10 Version 21H2 (10.0.19044.0 to before 10.0.19044.7846)
• Windows 10 Version 22H2 (10.0.19045.0 to before 10.0.19045.7846; to be verified against MSRC)
• Windows 11 Version 23H2 (10.0.22631.0 to before 10.0.22631.7711)
• Windows 11 Version 24H2 (10.0.26100.0 to before 10.0.26100.9974; to be verified against MSRC)
• Windows 11 Version 25H2 (10.0.26200.0 to before 10.0.26200.9974; to be verified against MSRC)
• Windows 11 Version 26H1 (10.0.28000.0 to before 10.0.28000.3501)
• Windows 11 Version 26H2 (10.0.26300.0 to before 10.0.26300.9974)
• Windows Server 2016 incl. Server Core (10.0.14393.0 to before 10.0.14393.9688)
• Windows Server 2019 incl. Server Core (10.0.17763.0 to before 10.0.17763.9487)
• Windows Server 2022 (10.0.20348.0 to before 10.0.20348.5870)

Fixed in

• Install the Microsoft security update for November 2026 that brings each affected build to the listed fixed version or later.
• KB numbers: Unknown.

Workaround

Unknown. No vendor-recommended workaround was identified in the sources reviewed.

Exploitation

• Public exploit code: Unknown.
• Exploitation in the wild: not confirmed in the sources reviewed.
• CISA SSVC: exploitation none, automatable no, technical impact total.

Our recommendation

• Apply the November 2026 cumulative update to all affected Windows 10, Windows 11 and Windows Server hosts, starting with those that connect to SQL Server.
• Verify the exact fixed builds for your editions in the MSRC Security Update Guide before rollout.
• Inventory Windows systems that are still on unsupported or older builds such as 1607, 1809 and 21H2.
• Limit access to SQL Server to required hosts and users, and train staff not to open untrusted files or links.
• Re-check exploitation status after the patch cycle, because the NVD analysis is still pending.

Public exploits iAttack code is publicly available (PoC on GitHub, Metasploit or Exploit-DB).

PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.

Research sources

• CVE.org CNA record CVE-2026-116698 www.cve.org
• Microsoft Security Update Guide CVE-2026-116698 msrc.microsoft.com
• Strix CVE-2026-116698 (third-party, unverified) www.strix.ai

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, 05:46.