Heap-Based Buffer Overflow in MZ Automation libiec61850 Product
CVE-2026-19259

4.8MEDIUM

Key Information:

Vendor

Mz Automation

Status
Libiec61850
Vendor
CVE Published:
8 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19259?

A heap-based buffer overflow vulnerability exists in MZ Automation's libiec61850 product, specifically within the MmsMapping_varAccessSpecToObjectReference function found in the src/iec61850/common/iec61850_common.c file. This vulnerability is triggered by improper handling of the GetNamedVariableListAttributesResponse.itemId argument. Local exploitation of this flaw could allow an attacker to manipulate memory, leading to potential unauthorized access or execution of malicious code. This issue was reported to the project maintainers, but as of now, there has been no response or patch issued to remediate the vulnerability.

Affected Version(s)

libiec61850 1.6.0

libiec61850 1.6.1

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-2026-19259 - Proof of Concept

References

https://vuldb.com/vuln/387009
vdb-entrytechnical-description
https://vuldb.com/vuln/387009/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-19259
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)
VulDB CNA Team
.