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Windows 10: Heap-based buffer overflow in Windows Overlay Filter

CVE-2026-69958Medium 6.8

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Summary

Windows Overlay Filter in several Windows 10, Windows 11 and Windows Server versions contains a heap-based buffer overflow (CWE-122). The CNA title calls it a Remote Code Execution vulnerability, but the description and the CVSS vector (AV:P) require physical access to the device. An attacker with physical access could execute code with high impact on confidentiality, integrity and availability. CISA SSVC rates exploitation as none and automatable as no.

Affected

  • Windows 10 Version 1607: 10.0.14393.0 to below 10.0.14393.9612
  • Windows 10 Version 1809: 10.0.17763.0 to below 10.0.17763.9376
  • Windows 10 Version 21H2: 10.0.19044.0 to below 10.0.19044.7807
  • Windows 10 Version 22H2: 10.0.19045.0 to below 10.0.19045.7807
  • Windows 11 Version 23H2: 10.0.22631.0 to below 10.0.22631.7652
  • Windows 11 Version 24H2: 10.0.26100.0 to below 10.0.26100.9711
  • Windows 11 Version 25H2: 10.0.26200.0 to below 10.0.26200.9711
  • Windows 11 Version 26H1: 10.0.28000.0 to below 10.0.28000.3231
  • Windows 11 Version 26H2: 10.0.26300.0 to below 10.0.26300.9711
  • Windows Server 2012 and Server Core: 6.2.9200.0 to below 6.2.9200.26434
  • Windows Server 2012 R2 and Server Core: 6.3.9600.0 to below 6.3.9600.23470
  • Windows Server 2016: 10.0.14393.0 to below 10.0.14393.9612

Fixed in

  • Windows 10 Version 1607 and Windows Server 2016: build 10.0.14393.9612 or later (CNA data, confirm on MSRC)
  • Other listed versions: builds as stated under affected (CNA data)
  • KB numbers: Unknown.

Workaround

Unknown. No vendor workaround was found.

  • Devices that cannot be patched: restrict physical access, enable BitLocker with TPM and PIN, set a UEFI/BIOS password and block boot from external media.

Exploitation

  • In the wild: no evidence found.
  • Public proof-of-concept code: none found.
  • CISA SSVC: exploitation none, automatable no.
  • EPSS: about 0.44%, varies by snapshot.

Our recommendation

  • Inventory all Windows devices and identify affected builds, including Windows 10 1607 and Server 2016.
  • Install the fixed build from Microsoft Update as soon as it is confirmed on the MSRC advisory.
  • Check the Microsoft lifecycle status of Windows 10 1607 before planning; devices without a fix need replacement or isolation.
  • Verify BitLocker on laptops and devices in unattended areas.
  • Restrict physical access to shared, reception and kiosk devices.

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, Windows ESU (Extended Security Updates)
Updates (KB)
KB5127648, KB5126651, KB5126655, KB5126657, KB5126646, KB5126653

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 4 Nov 2026, 22:08.

Original description (NVD)

Heap-based buffer overflow in Windows Overlay Filter allows an unauthorized attacker to execute code with a physical attack.

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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