CVE-2026-78012 Stack-based Buffer Overflow in Pyramid Solutions NetStaX EtherNet/IP Stack
A stack-based buffer overflow in the NetStaX EtherNet/IP stack allows remote attackers to cause device crashes or potentially execute code via large Class 3 requests.
- 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-2026-78012?
CVE-2026-78012 is a critical memory corruption vulnerability in Pyramid Solutions EtherNet/IP Adapter DLL Kit (EIPA), published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-121
Which versions are affected by CVE-2026-78012?
How do I fix CVE-2026-78012?
No fix has been published for CVE-2026-78012 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-2026-78012 being exploited?
There is no known exploitation of CVE-2026-78012 in the wild and no public exploit code.
Sources
Also known as GHSA-xw8p-j9mr-grph.