Microsoft Windows DirectX: Buffer overflow allows local privilege escalation

Summary

A heap-based buffer overflow in the Windows DirectX components allows an authorized local user to elevate privileges, according to the CVE record published by Microsoft as CNA. An attacker needs local logon with low privileges and no user interaction, and the impact on confidentiality, integrity and availability is high once the attacker can run code on the system. The flaw is not a remote entry point on its own, so the risk is highest on multi-user systems such as terminal servers and shared workstations. No public exploitation has been confirmed so far.

Affected

• Windows 10 Version 1809 (before 10.0.17763.9376)
• Windows 10 Version 21H2 (before 10.0.19044.7807)
• Windows 10 Version 22H2 (before 10.0.19045.7807)
• Windows 11 Version 23H2 (before 10.0.22631.7652)
• Windows 11 Version 24H2 (before 10.0.26100.9711)
• Windows 11 Version 25H2 (before 10.0.26200.9711)
• Windows 11 Version 26H1 (before 10.0.28000.3231)
• Windows 11 Version 26H2 (before 10.0.26300.9711)
• Windows Server 2019, including Server Core (before 10.0.17763.9376)
• Windows Server 2022 (before 10.0.20348.5761)
• Windows Server 2025, including Server Core (before 10.0.26100.33650)

Note: a third-party mirror lists differing entries for some builds; verify on MSRC.

Fixed in

• Install the Microsoft security update that brings the affected builds to the fixed build numbers listed above.
• KB article numbers: Unknown. Check the MSRC advisory.

Workaround

Unknown. No vendor-published workaround was found. Apply the Microsoft update as the main control.

Exploitation

• No public exploitation confirmed as of the research date.
• CISA SSVC assessment: exploitation none, automatable no, technical impact total.
• CVSS exploit code maturity is unproven (E:U).
• No public proof of concept or CISA KEV entry was found; the CVE was published on 2026-11-10.

Our recommendation

• Confirm the build numbers and KB articles for each Windows version on MSRC.
• Inventory Windows 10 and Windows Server 2019 hosts, prioritising multi-user systems, RDS or terminal servers and shared workstations.
• Patch in the next regular cycle, or sooner on multi-user hosts.
• Plan an upgrade or ESU for Windows 10 builds that are out of support.
• Re-check MSRC, NVD and CISA KEV for exploitation updates.

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-2026-94507 msrc.microsoft.com
• CVE.org record CVE-2026-94507 www.cve.org
• Strix CVE-2026-94507 (third-party mirror) www.strix.ai
• Zero Day Initiative: November 2026 security update review www.zerodayinitiative.com
• NTCompatible: November 2026 Patch Tuesday coverage www.ntcompatible.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, 03:13.