Windows Advanced Rasterization Platform: Local privilege escalation
Summary
A heap-based buffer overflow in the Windows Advanced Rasterization Platform (WARP) allows an authorized attacker with local access and low privileges to elevate privileges. According to the CVSS vector (8.8, high), no user interaction is required and the impact on confidentiality, integrity and availability is high. An attacker needs an existing foothold on the system, such as a standard user account or user-level malware.
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, per aggregator, unverified)
- Windows 11 Version 25H2 (10.0.26200.0 before 10.0.26200.9711, per aggregator, unverified)
- 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
- Windows 10 1809, 21H2 and 22H2: Patch Tuesday update of 10 November 2026 (KB5131096 for Windows 10 ESU; fixed builds 10.0.17763.9376, 10.0.19044.7807, 10.0.19045.7807)
- Windows 11 and Windows Server: Cumulative updates of 10 November 2026 (for example KB5132061 and KB5131087). Exact fixed builds unverified: sources conflict, so check the MSRC table.
Workaround
Unknown.
Exploitation
- Exploited in the wild: No evidence found; CISA SSVC assessment: exploitation none.
- Automatable: no (CISA SSVC).
- Public proof of concept: None found.
- Microsoft's exploit maturity at publication: unproven (E:U in the CVE.org record).
Our recommendation
- Install the November 2026 cumulative updates on all affected Windows 10, Windows 11 and Windows Server systems, prioritising multi-user systems and terminal servers.
- Verify the fixed build numbers in the MSRC Security Update Guide before rollout, since sources conflict for Windows 11 and Windows Server.
- Restrict local logon and standard user accounts where possible, and monitor for unexpected SYSTEM processes or privilege changes.
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
- Microsoft Security Update Guide: CVE-2026-118277 msrc.microsoft.com
- CVE.org record CVE-2026-118277 www.cve.org
- Bleeping Computer: Windows 11 KB5132061 and KB5131087 cumulative updates www.bleepingcomputer.com
- Bleeping Computer: Windows 10 KB5131096 Extended Security Update www.bleepingcomputer.com
- Bleeping Computer: Microsoft November 2026 Patch Tuesday www.bleepingcomputer.com
- PT-2026-118277 (Vulners) vulners.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, 22:11.
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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