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CVE-2026-66364— MZ Automation libiec61850 Out-of-bounds Read

Quick assessment

Affected
MZ Automation GmbH libiec61850
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mz Automation libIEC61850是德国Mz Automation公司的一款用于电力系统通信的协议实现库。 Mz Automation libIEC61850 1.6.2之前版本存在缓冲区错误漏洞，该漏洞源于GOOSE有效载荷解析器存在边界处理缺陷，攻击者可通过单个未认证的Layer 2组播帧触发，导致解析器越界读取一个字节，可能造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.29% · P19

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
MZ Automation GmbH libiec61850 < 1.6.2 affected
1.6.2 unaffected
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I. Basic Information for CVE-2026-66364

Vulnerability Information
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Vulnerability Title
MZ Automation libiec61850 Out-of-bounds Read
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Mz Automation libIEC61850 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mz Automation libIEC61850是德国Mz Automation公司的一款用于电力系统通信的协议实现库。 Mz Automation libIEC61850 1.6.2之前版本存在缓冲区错误漏洞，该漏洞源于GOOSE有效载荷解析器存在边界处理缺陷，攻击者可通过单个未认证的Layer 2组播帧触发，导致解析器越界读取一个字节，可能造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MZ Automation GmbH libiec61850 0 ~ 1.6.2 -

II. Public POCs for CVE-2026-66364

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III. Intelligence Information for CVE-2026-66364

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Vendor Advisories for CVE-2026-66364 (2)

Same Patch Batch · MZ Automation GmbH · 2026-07-30 · 8 CVEs total

CVE-2026-66360 7.5 HIGH MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-66349 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-65421 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-56758 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-66369 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-66720 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-63550 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read

IV. Related Vulnerabilities

Same product: libiec61850
Same vendor: MZ Automation GmbH
Same weakness: CWE-125

V. Comments for CVE-2026-66364

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