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Windows: Buffer over-read in Windows Overlay Filter allows local code execution

CVE-2026-69942High 7.8

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Summary

A buffer over-read (CWE-126) in the Windows Overlay Filter component affects Windows 11 (23H2, 24H2, 25H2, 26H1, 26H2) and Windows Server 2022 and 2025. An attacker who already has a local, low-privileged account or foothold can run code with high impact on confidentiality, integrity and availability, without user interaction. The title of the Microsoft record says "Remote Code Execution", but the CVSS vector is local (AV:L), so this is treated as a local issue. Shared and multi-user Windows systems and terminal servers are the most exposed.

Affected

  • Windows 11 23H2: builds 10.0.22631.0 to before 10.0.22631.7652
  • Windows 11 24H2: builds 10.0.26100.0 to before 10.0.26100.9711
  • Windows 11 25H2: builds 10.0.26200.0 to before 10.0.26200.9711
  • Windows 11 26H1: builds 10.0.28000.0 to before 10.0.28000.3231
  • Windows 11 26H2: builds 10.0.26300.0 to before 10.0.26300.9711
  • 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

  • Windows 11 23H2: 10.0.22631.7652 or later
  • Windows 11 24H2: 10.0.26100.9711 or later
  • Windows 11 25H2: 10.0.26200.9711 or later
  • Windows 11 26H1: 10.0.28000.3231 or later
  • Windows 11 26H2: 10.0.26300.9711 or later
  • Windows Server 2022: 10.0.20348.5761 or later
  • Windows Server 2025: 10.0.26100.33650 or later

KB numbers per build: KB5126653 (Windows 11 23H2) and KB5126646 (Windows Server 2025) according to third-party listings; verify on the MSRC page. No KB numbers found for the other editions.

Workaround

Unknown. No workaround or mitigation was found; the official fix is the remedy.

Exploitation

  • No evidence of exploitation in the wild found.
  • Not listed in the CISA KEV catalogue as of 23 Oct 2026.
  • No public proof of concept found.
  • MSRC rates exploit code maturity as Unproven.
  • EPSS is about 0.003 (about 0.3% within 30 days).
  • CISA SSVC: exploitation none, automatable no, technical impact total.

Our recommendation

  • Install the October 2026 cumulative update on all affected Windows 11 and Windows Server systems, prioritising shared, multi-user and terminal servers.
  • Verify the installed build against the fixed versions after rollout.
  • If patching is delayed, restrict local logon to trusted users and monitor for unusual local code execution.
  • Lower priority for single-user endpoints without an existing compromise, but still treat it as a standard patch item.

Information from Microsoft (Patch Tuesday October 2026)

Severity (Microsoft)
Important
Impact
Remote code execution – Windows Overlay Filter
Status on Patch Tuesday
Neither exploited nor publicly disclosed
Exploitability assessment
Exploitation less likely
Product family
Windows
Updates (KB)
KB5126655, KB5126646, KB5127648, KB5126653, KB5127646

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 2 Nov 2026, 04:41.

Original description (NVD)

Buffer over-read in Windows Overlay Filter allows an authorized attacker to execute code 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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