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CVE-2026-56758— 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 GmbH libiec61850是德国MZ Automation GmbH公司开源的一套支持IEC 61850标准的工业通信组件。 MZ Automation GmbH libiec61850 1.6.2之前版本存在缓冲区错误漏洞，该漏洞源于ACSE层在处理MMS连接建立期间的AARQ PDU时，对调用AP标题中攻击者控制的长度值（零或一）验证不当，导致解析器越界读取堆缓冲区，可能造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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-2026-56758

Vulnerability Information
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Vulnerability Title
MZ Automation libiec61850 Out-of-bounds Read
Source: CVE Program / CVE List V5
Vulnerability Description
The ACSE layer contains a flaw in the processing of AARQ PDUs during MMS connection establishment. When parsing certain fields within the calling AP title, an attacker controlled length value of zero or one may cause the parser to read past the end of a heap buffer.
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 GmbH libiec61850 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MZ Automation GmbH libiec61850是德国MZ Automation GmbH公司开源的一套支持IEC 61850标准的工业通信组件。 MZ Automation GmbH libiec61850 1.6.2之前版本存在缓冲区错误漏洞，该漏洞源于ACSE层在处理MMS连接建立期间的AARQ PDU时，对调用AP标题中攻击者控制的长度值（零或一）验证不当，导致解析器越界读取堆缓冲区，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-2026-56758

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III. Intelligence Information for CVE-2026-56758

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Vendor Advisories for CVE-2026-56758 (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-2026-66364 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-65421 6.5 MEDIUM MZ Automation libiec61850 Out-of-bounds Read
CVE-2026-66369 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-2026-56758

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