CVE-2026-8312 Rockwell Automation Arena® - Memory Corruption Vulnerability

High 7.0 Published 14 Jul 2026 Updated 14 Jul 2026

An attacker can execute arbitrary code by tricking a user into opening a malicious file in Rockwell Arena Simulation due to an out-of-bounds write.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-8312?

CVE-2026-8312 is a high-severity memory corruption vulnerability in Rockwell Auotmation Arena® Simulation, published on 14 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

A security issue exists within Arena® Simulation due to a memory corruption vulnerability in the expmt.exe (Siman) component. The vulnerability stems from improper validation of user-supplied data, which can result in an out-of-bounds write. An attacker could leverage this vulnerability to execute arbitrary code in the context of the current process by convincing a user to open a malicious file.

Weakness: CWE-787

Which versions are affected by CVE-2026-8312?

It affects 1 product.

Products include Rockwellautomation Arena.

How do I fix CVE-2026-8312?

No fix has been published for CVE-2026-8312 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-2026-8312 being exploited?

There is no known exploitation of CVE-2026-8312 in the wild and no public exploit code.

Sources

Also known as GHSA-pf76-r749-m2hh.