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Windows Advanced Rasterization Platform: Heap overflow allows local privilege escalation

CVE-2026-94515High 7.8

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Summary

A heap-based buffer overflow in the Windows Advanced Rasterization Platform (WARP) allows an authorized local user to elevate privileges. An attacker needs valid low-privilege access to the machine, for example after phishing or malware infection, and can then gain SYSTEM rights. The flaw is not remotely exploitable. The NVD analysis is still pending, and the CNA scores the vulnerability at 7.8 (High).

Affected

  • Windows 10 Version 1809 and Windows Server 2019 (including Server Core): builds 10.0.17763.0 to before 10.0.17763.9376
  • Windows 10 Version 21H2: builds 10.0.19044.0 to before 10.0.19044.7807
  • Windows 10 Version 22H2: builds 10.0.19045.0 to before 10.0.19045.7807
  • Windows 11 Version 23H2: builds 10.0.22631.0 to before 10.0.22631.7652
  • Windows 11 Version 24H2, 25H2, 26H2 and Windows 11 26H1: ranges listed by the CNA record are incomplete or unconfirmed; check MSRC
  • Windows Server 2022: builds 10.0.20348.0 to before 10.0.20348.5761
  • Windows Server 2025 (including Server Core): builds 10.0.26100.0 to before 10.0.26100.33650

Fixed in

Fixed builds according to the CNA record: see the affected list above (for example 10.0.17763.9376 or later for Windows 10 1809 and Server 2019). Unverified: the fixed builds may be inconsistent with the release date of the update, so confirm them against the MSRC entry before reporting compliance.

Workaround

Unknown.

Exploitation

  • CISA SSVC assessment: exploitation none, automatable no, technical impact total.
  • No CISA KEV entry, vendor exploitation flag or public proof of concept was found at the time of writing.
  • The CVSS vector indicates that the CNA knows of no exploit code (E:U).

Our recommendation

  • Install the security update for all affected Windows builds through Windows Update or WSUS, and prioritise shared workstations, terminal servers and multi-user systems.
  • Check whether Windows 10 1809 and 22H2 systems still receive security updates (ESU or otherwise) before assuming they will get this patch.
  • Verify the installed build numbers against the MSRC entry.
  • Monitor for privilege-escalation activity with EDR and limit local logon rights.

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)
KB5126651, KB5126657, KB5126655, KB5126653, KB5127648, KB5126646

Entry in the Microsoft Security Update Guide

Public exploits

PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.

Research sources

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.

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:

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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