Windows Advanced Rasterization Platform: Heap buffer overflow, local privilege escalation
Summary
A heap-based buffer overflow in the Windows Advanced Rasterization Platform (WARP), the software rasterizer of the DirectX graphics stack, allows a local attacker with low privileges to elevate privileges. No user interaction is required, but the attacker must already have a foothold on the system, for example through a phished account or malware. The CVSS score is 8.8 (v3.1). Microsoft has released a fix, and no exploitation or public proof of concept is known.
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 and Server Core installation (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 and Server Core installation (10.0.26100.0 to before 10.0.26100.33650)
Source: CNA record. Build ranges for the other mirrors were not verified.
Fixed in
Fixed in the November 2026 Patch Tuesday cumulative updates for the builds listed above. KB article numbers: Unknown.
Workaround
Unknown. No mitigation has been identified; applying the security update is the remedy.
Exploitation
- No exploitation known at publication.
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
- CNA record: exploit maturity Unproven (E:U), remediation level Official fix (RL:O).
- No public proof of concept found.
Our recommendation
- Install the November 2026 cumulative update on all affected Windows 10, 11 and Server systems, prioritising multi-user systems, terminal servers and shared workstations.
- Confirm Extended Security Updates (ESU) enrolment for Windows 10 systems and plan migration for Windows 11 23H2 Enterprise and Education endpoints, which have reached end of servicing.
- Verify the affected build list against the MSRC advisory before relying on it.
- Monitor for signs of privilege escalation on endpoints and review local account usage.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Advanced Rasterization Platform
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5127648, KB5126646, KB5127646, KB5126651, KB5126657, KB5126655
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE record (CNA) www.cve.org
- Microsoft Security Response Center advisory msrc.microsoft.com
- Microsoft Learn: DirectX WARP learn.microsoft.com
- Wikipedia: Windows Advanced Rasterization Platform en.wikipedia.org
- Tenable: November 2026 Patch Tuesday www.tenable.com
- NTCompatible: November 2026 Patch Tuesday summary 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 10 Nov 2026, 22:08.
Original description (NVD)
Heap-based buffer overflow in Windows Advanced Rasterization Platform allows an authorized attacker to elevate privileges locally.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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