CVE-2026-84854 Out of Bound Write on WibuKey for Windows
A local attacker can trigger an out-of-bounds write in the WibuKey Windows driver, causing a system crash or potential kernel memory modification.
- 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-2026-84854?
CVE-2026-84854 is a high-severity memory corruption vulnerability in wibu-systems-ag wibukey, published on 6 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-787
Which versions are affected by CVE-2026-84854?
How do I fix CVE-2026-84854?
No fix has been published for CVE-2026-84854 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-2026-84854 being exploited?
There is no known exploitation of CVE-2026-84854 in the wild and no public exploit code.
Sources
Also known as GHSA-pc55-w49m-q7wf.