Vulnerability · Published Oct 26, 2026 · Assigned by ENISA
CVE-2026-70388Memory Corruption via Integer Underflow in Message Length Validation
High 8.3
In plain English
A high-severity out-of-bounds write in SOEM from RT-Labs AB. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).
Official description
SOEM version 2.0.0 and earlier contains vulnerabilities where a malicious device on the network can send specially crafted messages that cause the master to write data outside allocated memory boundaries. The software performs arithmetic on message length values without proper validation, allowing negative or extremely large values to bypass safety checks. This can corrupt memory and potentially allow an attacker to execute arbitrary code on the master system.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| RT-Labs AB | SOEM | 0 – before 2.0.1 |
Weakness: CWE-191, CWE-195, CWE-787 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H