MZ Automation libIEC61850 IEC 61850 flaws disclosed
Four vulnerabilities in MZ Automation's libIEC61850 library could let network-adjacent attackers crash or execute code on IEC 61850 substation devices, with no known active exploitation.
Sourcecisa.gov — open the original
What to check
- Applies to
- The 4 CVEs 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 has published an ICS advisory detailing four vulnerabilities in MZ Automation's libIEC61850 library, an open-source implementation of the IEC 61850 protocol used for substation automation and protection/control functions across critical manufacturing, energy, and transportation sectors worldwide. Affected versions range from v1.0.0 through v1.6.1.
The most severe issue, CVE-2026-49035, is a heap-based buffer overflow in MMS Initiate request handling that has been demonstrated to achieve remote code execution when ASLR is disabled, with memory corruption or denial-of-service possible when ASLR is enabled. CVE-2026-50039 is a stack-based buffer overflow triggerable via a ReadRequest, also risking memory corruption. Two additional NULL pointer dereference flaws (CVE-2026-50103 in the GOOSE/R-GOOSE parser, and CVE-2026-50032 in the MMS Write Named Variable List handler) allow network-adjacent attackers to crash subscribing applications or servers via crafted GOOSE frames or malformed WriteRequests.
CISA states no known public exploitation has been reported at this time. MZ Automation recommends updating to the latest build available on its GitHub repository. Standard ICS defense-in-depth guidance applies: minimize internet exposure of control system devices, isolate ICS networks behind firewalls, and use secured VPNs for remote access.
Mentioned in this report
Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-26-204-06
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 16,445 reports from 149 sources, 666 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