Heap-Based Buffer Overflow in MZ Automation libiec61850 Component
CVE-2026-19206

4.8MEDIUM

Key Information:

Vendor

Mz Automation

Status
Libiec61850
Vendor
CVE Published:
7 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19206?

A vulnerability has been identified in MZ Automation's libiec61850 library, specifically within the ASDU Element Handler. This flaw stems from the function SVReceiver_stopThreadless located in src/sampled_values/sv_subscriber.c, leading to a heap-based buffer overflow. The vulnerability necessitates local access for exploitation, posing significant risks if exploited by malicious actors. A public exploit has been released, urging users to upgrade to version 1.6.2, which addresses this issue through the application of a security patch.

Affected Version(s)

libiec61850 1.6.0

libiec61850 1.6.1

libiec61850 1.6.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-19206 - Proof of Concept

References

https://vuldb.com/vuln/386950
vdb-entrytechnical-description
https://vuldb.com/vuln/386950/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-19206
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Chuan Wei
SCU_1CP (VulDB User)
SCU_1CP (VulDB User)
.