CVE-2026-12656 1732E ArmorBlock® - Multiple Vulnerabilities
Attackers can cause denial of service on Rockwell ArmorBlock I/O modules by sending network storm traffic, requiring a power cycle to recover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12656?
CVE-2026-12656 is a high-severity denial of service vulnerability in Rockwell Automation 1732E ArmorBlock® I/O, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A denial-of-service security issue exists in the affected product and version. The security issue stems from improper handling of network storm traffic, which can interrupt communication, cause device faults, and affect open TCP and UDP ports. A power cycle is required to recover the device to its normal state.
Weakness: CWE-770
Which versions are affected by CVE-2026-12656?
How do I fix CVE-2026-12656?
No fix has been published for CVE-2026-12656 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-12656 being exploited?
There is no known exploitation of CVE-2026-12656 in the wild and no public exploit code.
Sources
Also known as GHSA-h935-ghxg-4xm5.