CVE-2026-66720
Medium
Description
The GOOSE subscriber component improperly validates the UTC timestamp field in unauthenticated IEC 61850 GOOSE (EtherType 0x88B8) Layer-2 multicast messages. A specially crafted GOOSE frame containing an undersized timestamp field can trigger a heap out-of-bounds read during message processing, causing the process to crash and resulting in a denial-of-service condition.
SeverityMedium
CVSS6.5
Exploit probability—
ProductMz Automation Gmbh Libiec61850
PublishedJul 30, 2026
First seenJul 30, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- MZ Automation GmbH libiec618501.6.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| MZ Automation GmbH libiec61850 | v < 1.6.2 | 1.6.2 |
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