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Microsoft Windows HID Parser Library: Elevation of privilege via out-of-bounds read

CVE-2026-125135Medium 6.8

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Summary

The HID Parser Library in multiple supported Windows 10, Windows 11 and Windows Server versions contains an out-of-bounds read (CWE-125). An unauthorized attacker with physical access to a device can elevate privileges to a higher level. Exploitation requires physical access and no account, so the risk is mainly for lost, stolen or unattended devices and shared PCs.

Affected

  • Windows 10 Version 1607 and Windows Server 2016 (including Server Core): builds before 10.0.14393.9688
  • Windows 10 Version 1809 and Windows Server 2019 (including Server Core): builds before 10.0.17763.9487
  • Windows 10 Version 21H2: builds before 10.0.19044.7846
  • Windows 10 Version 22H2: builds before 10.0.19045.7846
  • Windows 11 Version 23H2: builds before 10.0.22631.7711
  • Windows 11 Version 24H2: builds before 10.0.26100.9974
  • Windows 11 Version 25H2 and 26H2: builds before 10.0.26200.9974 and 10.0.26300.9974
  • Windows 11 Version 26H1: builds before 10.0.28000.3501
  • Windows Server 2022: builds before 10.0.20348.5870

Fixed in

  • Installation of the November 2026 Windows security updates for each affected build (per the CVE record, the fixed builds are listed above).
  • The matching KB number per build must be confirmed on the MSRC advisory page; KB mappings from third-party sources are unverified.

Workaround

  • No vendor workaround known.
  • Until patched: restrict physical access to devices, enable BitLocker and a BIOS/UEFI password, and limit or disable unused USB ports on shared or public-facing machines.

Exploitation

  • Not known to be exploited.
  • Rapid7 rates exploitation as less likely and reports no public disclosure.
  • VulDB reports that no public exploit is available.
  • Microsoft's CISA SSVC assessment: exploitation none, not automatable, total technical impact.

Our recommendation

  • Install the November 2026 Windows security update on all affected clients and servers, and confirm the fixed build on the MSRC advisory page.
  • Prioritize laptops that leave the office and devices in public or shared spaces.
  • Restrict physical access to servers and workstations and enable BitLocker.
  • Verify patch status with your inventory or patch management tool.

Information from Microsoft (Patch Tuesday November 2026)

Severity (Microsoft)
Important
Impact
Elevation of privilege – HID Parser Library
Status on Patch Tuesday
Neither exploited nor publicly disclosed
Exploitability assessment
Exploitation less likely
Product family
Windows, Windows ESU (Extended Security Updates)
Updates (KB)
KB5131291, KB5131085, KB5131096, KB5131090, KB5131087, KB5132061

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, 10:33.

Original description (NVD)

Out-of-bounds read in HID Parser Library allows an unauthorized attacker to elevate privileges 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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