Quick answers
- Is CVE-2026-12656 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-12656 being exploited in the wild.
- How severe is CVE-2026-12656?
- Informational severity, published 13 October 2026.
- Which products and versions are affected?
- Rockwell Automation 1732E ArmorBlock I/O 3.012 and earlier.
- Is there a fix for CVE-2026-12656?
- Yes: fixed in 3.013. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-12656 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-12656?
- Check whether you run Rockwell Automation 1732E ArmorBlock I/O at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 3.013
Technical details
The vulnerability stems from improper handling of network storm traffic (CWE-770: Allocation of Resources Without Limits or Throttling) in the 1732E ArmorBlock I/O module versions 3.012 and earlier. An attacker on the network can trigger a denial-of-service condition by sending malformed or excessive network traffic, causing TCP and UDP port faults and device unresponsiveness. The issue is fixed in firmware version 3.013.
Affected products
- Rockwell Automation 1732E ArmorBlock I/O 3.012 and earlier
Timeline
- 2026-10-13: disclosed
- 2026-10-13: patched