Vulnerability · Published Aug 27, 2026 · Assigned by wibu

CVE-2026-81581User input in WibuKey is used (without proper sanitization) to compute the address of a pointer, which can be exploited to let the user point to any storage, to which Windows responds with a denial of service.

High 8.8

In plain English

A high-severity memory corruption in wibukey from wibu-systems-ag. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.2%top 87.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Improper validation of memory boundaries in WibuKey64.sys of WibuKey up to 6.70 for Windows can be exploited by an attacker by setting the pointers outside the scope of the program. This usually results in a denial of service, yet we cannot rule out the possibility of exploits that can cause Remote Code Execution and Privilege Escalation (since the driver runs with system privileges).

Affected products (as reported)

Vendor	Product	Versions
wibu-systems-ag	wibukey	0 – before 6.71

Weakness: CWE-119 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

https://cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/AdvisoryWIBU-100057.pdf vendor-advisory