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Vulnerabilities CVE-2026-66364

CVE-2026-66364

Medium
Open
TLP:CLEAR

MZ Automation libiec61850 Out-of-bounds Read

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Description

The GOOSE payload parser contains a boundary handling flaw that can be triggered by a single unauthenticated Layer 2 multicast frame on the process bus. When processing specific payload fields, an attacker controlled inner element length may exceed its enclosing length, causing the parser to over read by one byte. This out-of-bounds read reliably terminates the subscriber process, resulting in a denial-of-service condition.

Details

CVSS Score
6.5
EPSS Score
0.18%

7.1th percentile

CVSS Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Jul 30, 2026
Last Modified
Jul 30, 2026
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