CVE-2026-81581 Memory corruption in wibukey
Attackers can trigger a denial of service or potentially escalate privileges via improper memory boundary validation in the WibuKey Windows driver.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-81581?
CVE-2026-81581 is a high-severity memory corruption vulnerability in wibu-systems-ag wibukey, published on 27 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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).
Weakness: CWE-119
Which versions are affected by CVE-2026-81581?
How do I fix CVE-2026-81581?
No fix has been published for CVE-2026-81581 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-81581 being exploited?
There is no known exploitation of CVE-2026-81581 in the wild and no public exploit code.
Sources
Also known as GHSA-m4jv-48jv-489g.