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Back to active CVEs
Critical · CVSS 9.8CVE-2026-78012

Stack-based Buffer Overflow in Pyramid Solutions NetStaX EtherNet/IP StackCVE-2026-78012

Answer in brief

CVE-2026-78012 records a Critical severity (CVSS 9.8) vulnerability in Stack-based Buffer Overflow in Pyramid Solutions NetStaX EtherNet/IP Stack. The current sources do not mark it as known exploited. The current feed maps Pyramid Solutions/EtherNet/IP Adapter Development Kit (EADK) (generic), Pyramid Solutions/EtherNet/IP Adapter Development Kit (EADK) (generic), Pyramid Solutions/EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE) (generic), Pyramid Solutions/EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE) (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 1, 2026Updated Sep 8, 2026Source checked Oct 16, 2026First seen by HOL Sep 1, 2026Material review Sep 8, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Not marked as known exploited
Affected software
15 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Pyramid Solutions/EtherNet/IP Adapter Development Kit (EADK) (generic), Pyramid Solutions/EtherNet/IP Adapter Development Kit (EADK) (generic), Pyramid Solutions/EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE) (generic), Pyramid Solutions/EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE) (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Pyramid Solutions/EtherNet/IP Adapter Development Kit (EADK)generic0Not reported
Pyramid Solutions/EtherNet/IP Adapter Development Kit (EADK)generic>=0 <=v5.6.1Not reported
Pyramid Solutions/EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE)generic0Not reported
Pyramid Solutions/EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE)generic>=0 <=v5.6.1Not reported
Pyramid Solutions/EtherNet/IP Adapter DLL Kit (EIPA)generic0Not reported
Pyramid Solutions/EtherNet/IP Adapter DLL Kit (EIPA)generic>=0 <=v5.6.1Not reported
Pyramid Solutions/EtherNet/IP Adapter DLL Kit with CIP Security (EIPA-SECURE)generic0Not reported
Pyramid Solutions/EtherNet/IP Adapter DLL Kit with CIP Security (EIPA-SECURE)generic>=0 <=v5.6.1Not reported
Pyramid Solutions/EtherNet/IP Scanner Development Kit (ESDK)generic0Not reported
Pyramid Solutions/EtherNet/IP Scanner Development Kit (ESDK)generic>=0 <=v5.6.1Not reported
Pyramid Solutions/EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE)generic>=0 <v5.6.1v5.6.1
Pyramid Solutions/EtherNet/IP Scanner DLL Kit (EIPS)generic0Not reported
Pyramid Solutions/EtherNet/IP Scanner DLL Kit (EIPS)generic>=0 <=v5.6.1Not reported
Pyramid Solutions/EtherNet/IP Scanner DLL Kit with CIP Security (EIPS-SECURE)generic0Not reported
Pyramid Solutions/EtherNet/IP Scanner DLL Kit with CIP Security (EIPS-SECURE)generic>=0 <=v5.6.1Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Pyramid Solutions/EtherNet/IP Adapter Development Kit (EADK), Pyramid Solutions/EtherNet/IP Adapter Development Kit (EADK), Pyramid Solutions/EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE).
  2. 2Review the reported fix. Source-reported 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/

Evidence timeline and material changes

  1. Published upstream

    Sep 1, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 1, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencepyramidsolutions.com
  • CISA Known Exploited Vulnerabilities catalogcisa.gov
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Netcore NR256CN through 1.5.140116 Pre-Auth Stack Overflow via Boa user_ok()Also CWE-121
  • IBM i is Affected By An Improper Privilege Management VulnerabilitySame generic ecosystem
  • IBM i is Affected by a Denial of Service in Digital Certificate ManagerSame generic ecosystem
  • IBM Db2 Genius Hub Improper verification of cryptographic signatureSame generic ecosystem
  • WIMOOR through commit ec86736 Authentication Bypass via Forged X-USERINFO HeaderSame generic ecosystem
  • DataBuff ai-apm-web through 0.1.10 Authentication Bypass via Hardcoded HMAC SecretSame generic ecosystem

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-121
Source
CVE List V5
Source checked
Oct 16, 2026
References
3 linked sources
Open source record