CVE-2026-12855 H19WMIHandlerSmm: unvalidated memory boundary could result in arbitrary code execution.
An unvalidated memory boundary in HP-specific InsydeH2O firmware allows arbitrary code execution, requiring firmware updates.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12855?
CVE-2026-12855 is a high-severity memory corruption vulnerability in InsydeH2O, published on 9 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Unvalidated memory boundary could result in arbitrary code execution. The vulnerability exists in the code developed specifically for HP projects.
Weakness: CWE-20
Which versions are affected by CVE-2026-12855?
How do I fix CVE-2026-12855?
No fix has been published for CVE-2026-12855 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-2026-12855 being exploited?
There is no known exploitation of CVE-2026-12855 in the wild and no public exploit code.
Sources
Also known as GHSA-w7c8-hp3q-qpv8.