Microsoft WDAC OLE DB provider for SQL: Remote Code Execution via heap overflow

Summary

A heap-based buffer overflow in the Microsoft WDAC OLE DB provider for SQL, a Windows data-access component used by applications that connect to SQL Server, allows an unauthorized attacker to execute code over a network. The CVSS vector requires no privileges but user interaction, and only the availability impact is rated high. Microsoft has released fixes in its November 2026 Patch Tuesday cycle, and no public exploit is known as of now.

Affected

• Windows 10 Version 1607 and Windows Server 2016 (including Server Core): builds before 10.0.14393.9688
• Windows 10 Version 1809 and Windows Server 2019 (including Server Core): builds before 10.0.17763.9487
• Windows 10 Version 21H2: builds before 10.0.19044.7846
• Windows 10 Version 22H2: builds before 10.0.19045.7846
• Windows 11 Version 23H2: builds before 10.0.22631.7711
• Windows 11 Version 24H2: builds before 10.0.26100.9974
• Windows 11 Version 25H2: builds before 10.0.26200.9974
• Windows 11 Version 26H1: builds before 10.0.28000.3501
• Windows 11 Version 26H2: builds before 10.0.26300.9974
• Windows Server 2022: builds before 10.0.20348.5870

Fixed in

• Install the November 2026 cumulative update for each affected Windows build. The fixed builds are the versions listed above.
• The fixed build for Windows 11 24H2 differs between the CVE record and a third-party source. Confirm the exact build in the MSRC advisory.
• No separate fix or hotfix found.

Workaround

Unknown.

Exploitation

• Rapid7 rates the CVE as "Exploitation Unlikely" and lists it as not publicly disclosed.
• ZDI reports that no issues in this release are publicly known or exploited.
• No public proof-of-concept found. Not listed in CISA KEV as far as found.
• CISA SSVC: exploitation none, automatable no, technical impact total.

Our recommendation

• Install the November 2026 cumulative update on all affected Windows 10, Windows 11 and Windows Server systems, prioritising servers and hosts that run SQL-connected applications.
• Check build numbers in your inventory, because older builds such as 1607 and 1809 are affected.
• Confirm the exact fixed builds in the MSRC advisory before rollout.
• Monitor for public exploit information and recheck the CVE status in a few days.

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

• Microsoft Security Update Guide: CVE-2026-116699 msrc.microsoft.com
• CVE.org record CVE-2026-116699 www.cve.org
• Rapid7: Patch Tuesday November 2026 www.rapid7.com
• Zero Day Initiative: November 2026 Security Update Review www.zerodayinitiative.com
• Strix: CVE-2026-116699 (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, 12:17.