Windows Advanced Rasterization Platform: Local privilege escalation via stack overflow

Summary

A stack-based buffer overflow in the Windows Advanced Rasterization Platform (WARP), a software rasterizer in Windows, allows a local attacker to elevate privileges. The attacker needs a valid low-privileged user account on the system and no user interaction is required. Successful exploitation can lead to full control of the system (CVSS 3.1 base score 8.8, scope changed); NVD analysis was still pending at the time of writing.

Affected

• Windows 10 Version 1809: 10.0.17763.0 to before 10.0.17763.9376
• Windows 10 Version 21H2: 10.0.19044.0 to before 10.0.19044.7807
• Windows 10 Version 22H2: 10.0.19045.0 to before 10.0.19045.7807
• Windows 11 Version 23H2: 10.0.22631.0 to before 10.0.22631.7652
• Windows 11 Version 24H2: 10.0.26100.0 to before 10.0.26100.9711
• Windows 11 Version 25H2: 10.0.26200.0 to before 10.0.26200.9711
• Windows 11 Version 26H1: 10.0.28000.0 to before 10.0.28000.3231
• Windows 11 Version 26H2: 10.0.26300.0 to before 10.0.26300.9711
• Windows Server 2019 (including Server Core): 10.0.17763.0 to before 10.0.17763.9376
• Windows Server 2022: 10.0.20348.0 to before 10.0.20348.5761
• Windows Server 2025 (including Server Core): 10.0.26100.0 to before 10.0.26100.33650

The CVE record is incomplete after the Windows 11 23H2 entry; Windows Server status and the full list should be verified against the MSRC advisory.

Fixed in

• Install the November 2026 cumulative update for each affected Windows build (per the MSRC Security Update Guide entry).
• Fixed builds according to the CVE record: 10.0.17763.9376 (Windows 10 1809 and Server 2019), 10.0.19044.7807 (21H2), 10.0.19045.7807 (22H2), 10.0.22631.7652 (23H2), 10.0.26100.9711 (24H2), 10.0.26200.9711 (25H2), 10.0.28000.3231 (26H1), 10.0.26300.9711 (26H2), 10.0.20348.5761 (Server 2022), 10.0.26100.33650 (Server 2025).
• Verify the build numbers against the MSRC advisory; KB numbers could not be confirmed.

Workaround

Unknown. No vendor-documented workaround was found; patching is the only known remediation.

Exploitation

• No evidence of in-the-wild exploitation was found; the CISA SSVC assessment lists exploitation as none and automatable as no.
• The CNA temporal values are E:U (no known exploit code at publication) and RC:C.
• No public proof of concept was found.
• KEV status was not confirmed on the CISA catalog; a secondary source lists it as not included.

Our recommendation

• Patch all affected Windows 10, Windows 11 and Windows Server systems with the November 2026 cumulative update during the normal Patch Tuesday cycle.
• Prioritise multi-user systems such as terminal servers, shared workstations and kiosks.
• Confirm the installed build number is at or above the fixed value.
• Monitor for exploit publications and CISA KEV updates, and reassess if exploit code 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

• CVE Record CVE-2026-105490 www.cve.org
• Microsoft Security Update Guide: CVE-2026-105490 msrc.microsoft.com
• Strix CVE index: CVE-2026-105490 (secondary, verify builds and KEV status) 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, 00:05.