CVE-2026-78012
An issue in the NetStaX EtherNet/IP Stack prior to v5.6.1 could allow a large Class 3 explicit-message request to exceed the application-side receive buffer without generating an error or warning. The result could be memory corruption, a device crash, or a potential remote attack vector without the originating device receiving a CIP error indicating that the request could not be processed.
- Published Sep 1, 2026
- CVSS 9.3 critical
- 0.6% chance of exploitation in the next 30 days (EPSS)
- A fix is available
Affected software
- Pyramid Solutions EtherNet/IP Adapter DLL Kit
- Pyramid Solutions EtherNet/IP Adapter DLL Kit with CIP Security
- Pyramid Solutions EtherNet/IP Adapter Development Kit
- Pyramid Solutions EtherNet/IP Adapter Development Kit with CIP Security
- Pyramid Solutions EtherNet/IP Scanner DLL Kit
- Pyramid Solutions EtherNet/IP Scanner DLL Kit with CIP Security
- Pyramid Solutions EtherNet/IP Scanner Development Kit
- Pyramid Solutions EtherNet/IP Scanner Development Kit with CIP Security