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CVE-2026-50103— Improper Handling of Syntactically Invalid Structure in MZ Automation libIEC61850

Quick assessment

Affected
MZ Automation 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Mz-automation个人开发者开源的一个 IEC 61850 协议的开源库。 Mz-automation libIEC61850 1.6.1及之前版本存在输入验证错误漏洞，该漏洞源于L2 GOOSE和R-GOOSE共享解析器中的空指针取消引用，可能允许相邻网络攻击者通过发送包含格式错误TLV值的特制GOOSE帧，导致订阅应用程序崩溃。

CVSS 6.5 · Medium EPSS 0.27% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
MZ Automation libIEC61850 1.0.0≤ 1.6.1 affected
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I. Basic Information for CVE-2026-50103

Vulnerability Information
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Vulnerability Title
Improper Handling of Syntactically Invalid Structure in MZ Automation libIEC61850
Source: CVE Program / CVE List V5
Vulnerability Description
A NULL pointer dereference in the L2 GOOSE and R-GOOSE shared parser, which may allow a network-adjacent attacker to crash a subscribing application by sending a crafted GOOSE frame containing a malformed TLV value.
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
语法无效结构处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Mz-automation libIEC61850 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mz-automation libiec61850是Mz-automation个人开发者开源的一个 IEC 61850 协议的开源库。 Mz-automation libIEC61850 1.6.1及之前版本存在输入验证错误漏洞，该漏洞源于L2 GOOSE和R-GOOSE共享解析器中的空指针取消引用，可能允许相邻网络攻击者通过发送包含格式错误TLV值的特制GOOSE帧，导致订阅应用程序崩溃。
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 libIEC61850 1.0.0 ~ 1.6.1 -

II. Public POCs for CVE-2026-50103

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III. Intelligence Information for CVE-2026-50103

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Vendor Advisories for CVE-2026-50103 (1)

Same Patch Batch · MZ Automation · 2026-07-23 · 5 CVEs total

CVE-2026-16002 8.2 HIGH Out-of-bounds Read in MZ Automation lib60870
CVE-2026-49035 8.1 HIGH Stack-based Buffer Overflow in MZ Automation libIEC61850
CVE-2026-50039 7.5 HIGH Stack-based Buffer Overflow in MZ Automation libIEC61850
CVE-2026-50032 7.5 HIGH NULL Pointer Dereference in MZ Automation libIEC61850

IV. Related Vulnerabilities

Same product: libIEC61850
Same vendor: MZ Automation
Same weakness: CWE-228

V. Comments for CVE-2026-50103

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