Windows: Out-of-bounds read in Advanced Rasterization Platform (WARP)
Summary
A out-of-bounds read in the Windows Advanced Rasterization Platform (WARP), the software graphics rendering component, allows an authorized local user to elevate privileges. The attacker needs valid low-privileged access to the system and no user interaction is required. The CVSS score is 8.8 (High), with a changed scope and high impact on confidentiality, integrity and availability.
Affected
- Windows 10 Version 1809 (10.0.17763.0 before 10.0.17763.9376)
- Windows 10 Version 21H2 (10.0.19044.0 before 10.0.19044.7807)
- Windows 10 Version 22H2 (10.0.19045.0 before 10.0.19045.7807)
- Windows 11 Version 23H2 (10.0.22631.0 before 10.0.22631.7652)
- Windows 11 Version 24H2 (10.0.26100.0 before 10.0.26100.9711)
- Windows 11 Version 25H2 (10.0.26200.0 before 10.0.26200.9711)
- Windows 11 Version 26H1 (10.0.28000.0 before 10.0.28000.3231)
- Windows 11 Version 26H2 (10.0.26300.0 before 10.0.26300.9711)
- Windows Server 2019 incl. Server Core (10.0.17763.0 before 10.0.17763.9376)
- Windows Server 2022 (10.0.20348.0 before 10.0.20348.5761)
- Windows Server 2025 incl. Server Core (10.0.26100.0 before 10.0.26100.33650)
Fixed in
- Install the November 2026 cumulative update for the affected Windows version.
- Verify that the build number is at or above the fixed build listed in the affected ranges above.
- Exact KB numbers per version: check the MSRC advisory or the Windows Update catalog.
Workaround
- No vendor workaround published. Unknown.
- Apply the security update as the primary measure.
Exploitation
- No evidence of exploitation in the wild found.
- No public proof-of-concept found.
- CISA SSVC assessment: exploitation none, automatable no, technical impact total.
- CVSS temporal metrics: exploit code maturity unproven, remediation level official fix.
Our recommendation
- Patch affected Windows 10, Windows 11 and Windows Server systems with the November 2026 cumulative update, starting with multi-user systems such as Remote Desktop servers and shared PCs.
- Prioritise systems that run outdated versions, such as Windows 10 1809, 21H2 and 22H2 and Windows 11 23H2, and check their end-of-support status.
- Limit local logon rights and remove unneeded low-privileged accounts.
- Monitor for unexpected privilege changes until patching is complete.
- Confirm the fix by checking the Windows build number after installation.
- Recheck the MSRC advisory and CISA KEV, as the status may change quickly.
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
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- MSRC Security Update Guide: CVE-2026-118278 msrc.microsoft.com
- CVE.org CVE Record CVE-2026-118278 www.cve.org
- Strix: CVE-2026-118278 (third-party, unconfirmed ranges) www.strix.ai
- BleepingComputer: Windows 10 KB5131096 extended security update www.bleepingcomputer.com
- BleepingComputer: Windows 11 KB5132061 and KB5131087 cumulative updates www.bleepingcomputer.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, 22:12.
Original description (NVD)
Out-of-bounds read 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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