Windows Advanced Rasterization Platform: Local privilege escalation via heap overflow

Summary

A heap-based buffer overflow in the Windows Advanced Rasterization Platform (WARP) allows an authorized local attacker to elevate privileges. The attacker needs a low-privileged account or local code execution on the affected system, and no user interaction is required. Microsoft rates the vulnerability CVSS 8.8 (High), and no public exploit code or exploitation has been reported at publication.

Affected

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

Fixed in

• Windows 10 Version 1809 and Windows Server 2019: 10.0.17763.9376 or later
• Windows 10 Version 21H2: 10.0.19044.7807 or later
• Windows 10 Version 22H2: 10.0.19045.7807 or later
• Windows 11 Version 23H2: 10.0.22631.7652 or later
• Windows 11 Version 24H2: 10.0.26100.9711 or later
• Windows 11 Version 25H2: 10.0.26200.9711 or later
• Windows 11 Version 26H1: 10.0.28000.3231 or later
• Windows 11 Version 26H2: 10.0.26300.9711 or later
• Windows Server 2022: 10.0.20348.5761 or later
• Windows Server 2025: 10.0.26100.33650 or later

Workaround

None documented in the sources checked. Install the security update.

Exploitation

• Exploited in the wild: no evidence found at publication.
• Public exploit code: none found.
• CISA SSVC assessment: exploitation none, automatable no, technical impact total.

Our recommendation

• Install the Microsoft security update for CVE-2026-105023 on all affected Windows 10, 11 and Server systems, prioritising multi-user systems, terminal servers and servers.
• Confirm the fixed build numbers and KB articles on the MSRC advisory before rollout.
• Check whether Windows 10 devices still receive security updates, or enrol them in Extended Security Updates.
• Monitor for a CISA KEV listing or public proof-of-concept code and escalate if either appears.

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-2026-105023 msrc.microsoft.com
• CVE Record: CVE-2026-105023 www.cve.org
• Strix: CVE-2026-105023 (secondary source) 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, 00:07.