Description
The GOOSE parser contains an off-by-one boundary-handling flaw that can
be triggered by a single unauthenticated Layer-2 multicast frame on the
process bus. When specific GOOSE message fields are processed, the
parser advances its internal buffer position incorrectly, resulting in a
heap out-of-bounds read. On affected platforms, this condition reliably
terminates the subscriber process and causes a denial-of-service.
Published: 2026-07-30
Score: 7.1 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

MZ Automation GmbH recommends that users update to version 1.6.2.

Tracking

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Advisories

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History

Fri, 31 Jul 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 31 Jul 2026 00:45:00 +0000

Type Values Removed Values Added
First Time appeared Mz-automation
Mz-automation libiec61850
Vendors & Products Mz-automation
Mz-automation libiec61850

Thu, 30 Jul 2026 23:15:00 +0000

Type Values Removed Values Added
Description The GOOSE parser contains an off-by-one boundary-handling flaw that can be triggered by a single unauthenticated Layer-2 multicast frame on the process bus. When specific GOOSE message fields are processed, the parser advances its internal buffer position incorrectly, resulting in a heap out-of-bounds read. On affected platforms, this condition reliably terminates the subscriber process and causes a denial-of-service.
Title MZ Automation libiec61850 Out-of-bounds Read
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Mz-automation Libiec61850
cve-icon MITRE

Status: PUBLISHED

Assigner: icscert

Published:

Updated: 2026-07-31T19:22:19.970Z

Reserved: 2026-07-27T19:32:49.390Z

Link: CVE-2026-66369

cve-icon Vulnrichment

Updated: 2026-07-31T19:22:15.759Z

cve-icon NVD

Status : Received

Published: 2026-07-30T23:16:53.377

Modified: 2026-07-31T20:16:54.120

Link: CVE-2026-66369

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-02T05:00:05Z

Weaknesses