Buffer Overflow Flaw Hits Pyramid NetStaX EtherNet/IP
A stack-based buffer overflow in Pyramid Solutions' NetStaX EtherNet/IP Stack could crash ICS devices or enable remote attacks; no active exploitation reported.
Sourcecisa.gov — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
CISA published an ICS advisory for a vulnerability in Pyramid Solutions' NetStaX EtherNet/IP Stack, a communications library used in industrial control devices across critical manufacturing, energy, water/wastewater, and chemical sectors worldwide. The flaw, tracked as CVE-2026-78012, arises when a large Class 3 explicit-message request exceeds the application-side receive buffer without triggering an error or warning, potentially resulting in memory corruption, a device crash, or a remote attack vector where the originating device never receives a CIP error indicating the request failed.
The vulnerability affects all NetStaX EtherNet/IP Adapter and Scanner DLL/Development Kits (with and without CIP Security) prior to version 5.6.1. Pyramid Solutions responsibly disclosed the issue to CISA and has released v5.6.1, which adds a compile-time assertion, a runtime payload-size check, and improved documentation of packet/buffer-size relationships to close the gap. CISA notes no known public exploitation targeting this vulnerability at this time and recommends standard ICS network segmentation, minimizing internet exposure, and secure VPN use where remote access is required.
Defenders operating products built on the affected NetStaX kits should prioritize upgrading to v5.6.1 and verify vendor firmware/software updates from downstream OEMs that embed this stack. This is a vendor-disclosed vulnerability with a patch already available, not an actively exploited threat, making it routine advisory-driven patch management rather than an urgent incident-response matter.
Mentioned in this report
Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-26-246-07
Free public brief. Slack alerts on the vendors you run come with the paid plans, and a new account gets three days of them, no card.
What this brief leaves out
This page is the free tier: the write-up, the severity, the names. In the app the same report carries live profiles of the CVEs it names. The paid plans add the security research and news reporting the free tier leaves out.
It sits in a corpus of 16,436 reports from 149 sources, 661 of them written in the last seven days, and it grows through the day.
A new account starts with three days of all of it, no card, then keeps the government and CERT reporting free. Slack alerts are a paid-plan feature: name the vendors you run and Slack hears about the reports that touch them, not the rest of the week's. Nothing is charged unless you subscribe.
Create a free account What it costs