---
id: CVE-2026-84854
title: >-
  In the WibuKey driver for Windows below Version 6.72, insufficient validation
  of user input when calculating the size of a kernel buffer could cause small
  amounts of data to be written outside the intended kernel buffer
summary: >-
  In the WibuKey driver for Windows below Version 6.72, insufficient validation
  of user input when calculating the size of a kernel buffer could cause small
  amounts of data to be written outside the intended kernel buffer. This can
  lead to…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-787
vendor: wibu-systems-ag
product: wibukey
affected:
  - wibukey < 6.72
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T12:16:50.587'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84854'
references:
  - url: >-
      https://cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/AdvisoryWIBU-100065.pdf
    label: 2fc02b1f-71e7-4514-a878-169626f68903
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-06T11:10:33.824135Z'
ingestedAt: '2026-10-06T10:55:47.392Z'
---

## Overview

In the WibuKey driver for Windows below Version 6.72, insufficient validation of user input when calculating the size of a kernel buffer could cause small amounts of data to be written outside the intended kernel buffer. This can lead to a system crash. Under unfavorable circumstances, adjacent kernel memory may be modified.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.