CVE-2026-78012
Critical
Description
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductEtherNet/IP Adapter DLL Kit (EIPA)
PublishedSep 1, 2026
First seenSep 1, 2026
Weakness typeCWE-121CWE-121
How to fix
Update
- Pyramid Solutions EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE)v5.6.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Pyramid Solutions EtherNet/IP Adapter DLL Kit (EIPA) | v ≤ v5.6.1 | — |
| Pyramid Solutions EtherNet/IP Adapter DLL Kit with CIP Security (EIPA-SECURE) | v ≤ v5.6.1 | — |
| Pyramid Solutions EtherNet/IP Adapter Development Kit (EADK) | v ≤ v5.6.1 | — |
| Pyramid Solutions EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE) | v ≤ v5.6.1 | — |
| Pyramid Solutions EtherNet/IP Scanner DLL Kit (EIPS) | v ≤ v5.6.1 | — |
| Pyramid Solutions EtherNet/IP Scanner DLL Kit with CIP Security (EIPS-SECURE) | v ≤ v5.6.1 | — |
| Pyramid Solutions EtherNet/IP Scanner Development Kit (ESDK) | v ≤ v5.6.1 | — |
| Pyramid Solutions EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE) | v < v5.6.1 | v5.6.1 |
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