CVE-2026-84854Hinoki check available

System crash via undersized kernel buffer allocation

Published Oct 6, 2026 · Updated Oct 6, 2026

Out-of-bounds write in WIBU-SYSTEMS AG WibuKey before 6.72 allows local users to crash Windows via crafted driver input. The Windows driver lets user input reduce a kernel allocation but still copies the full data, writing 36 bytes beyond the buffer. Exploitation requires local low-privileged access; the vendor describes privilege escalation through adjacent kernel memory as unproven.

CVSS severity7.0
High
EPSS probability0.10%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Out-of-bounds write in WIBU-SYSTEMS AG WibuKey before 6.72 allows local users to crash Windows via crafted driver input. The Windows driver lets user input reduce a kernel allocation but still copies the full data, writing 36 bytes beyond the buffer. Exploitation requires local low-privileged access; the vendor describes privilege escalation through adjacent kernel memory as unproven.

The record

CVE
CVE-2026-84854
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
WIBU-SYSTEMS AG
Product
WibuKey
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.72

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

WIBU-SYSTEMS AG · WibuKeyversion=0 <6.72

Published CVSS scores

7.0WIBU-SYSTEMS AGCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5WIBU-SYSTEMS AGCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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