CVE-2026-78012

Stack-based Buffer Overflow in Pyramid Solutions NetStaX EtherNet/IP Stack

Published Sep 1, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

NetStaX v5.6.1 addresses this issue with multiple layers of protection, including a compile-time assertion, a runtime payload-size check, and clearer documentation of the relationships between packet and buffer-size constants. https://pyramidsolutions.com/my-account/ For more information, see the Pyramid Solutions blog post "NetStaX v5.6.1: Protecting Against Silent Buffer Overflow in Ethernet/IP Stack Explicit Messages". https://pyramidsolutions.com/netstax-v-5-6-1-protecting-against-silent-buffer-overflow-in-ethernet-ip-stack-explicit-messages/

Tracking

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Advisories

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History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Stack-based Buffer Overflow in Pyramid Solutions NetStaX EtherNet/IP Stack
Weaknesses CWE-121
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

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Weaknesses

Sources

Status
PUBLISHED
Assigner
icscert
Published
Updated
Sep 4, 2026, 9:05 PM
Reserved
Aug 21, 2026, 10:15 PM
Status
Awaiting Analysis
Published
Sep 1, 2026, 3:17 PM
Modified
Sep 8, 2026, 3:28 PM