CVE-2026-19259
Received Received - Intake

Heap-based Buffer Overflow in MZ Automation libiec61850

Publication date: 2026-08-08

Last updated on: 2026-08-08

Assigner: VulDB

Description
A vulnerability has been found in MZ Automation libiec61850 up to 1.6.1. The affected element is the function MmsMapping_varAccessSpecToObjectReference of the file src/iec61850/common/iec61850_common.c of the component MMS Protocol Workflow. Such manipulation of the argument GetNamedVariableListAttributesResponse.itemId leads to heap-based buffer overflow. The attack must be carried out locally. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

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Meta Information

Published
2026-08-08
Last Modified
2026-08-08
Generated
2026-08-08
AI Q&A
2026-08-08
EPSS Evaluated
N/A
NVD
CVE-2026-19259
EUVD
EUVD-2026-54728

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mz_automation libiec61850 to 1.6.1 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

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Executive Summary

CVE-2026-19259 is a heap-based buffer overflow in the MZ Automation libiec61850 library up to version 1.6.1. The flaw occurs in the function MmsMapping_varAccessSpecToObjectReference when processing a malformed GetNamedVariableListAttributesResponse.itemId value like '$'. The function incorrectly assumes a specific string format and performs unsafe memory reads, leading to a buffer overflow.

Detection Guidance

To detect this vulnerability, use AddressSanitizer (ASan) during compilation of the libiec61850 library. Compile with -fsanitize=address and run the client application with a malformed itemId like "$" to trigger the heap-buffer-overflow. Monitor for crashes or ASan error messages indicating out-of-bounds reads.

Impact Analysis

This vulnerability allows a local attacker to cause a denial of service by crashing the client application. A remote malicious MMS server or man-in-the-middle attacker could exploit it during normal directory browsing operations, potentially disrupting services that rely on the libiec61850 library.

Compliance Impact

This vulnerability is a heap-based buffer overflow in libiec61850, which could allow local or remote attackers to cause denial of service or potentially execute arbitrary code. For compliance with GDPR or HIPAA, such vulnerabilities may violate requirements for data integrity, availability, and security controls, especially in industrial or healthcare systems using IEC 61850 protocols.

Mitigation Strategies

Immediately update to the latest patched version of libiec61850 if available. If not, apply strict input validation in the MmsMapping_varAccessSpecToObjectReference function to reject malformed itemId values like "$". Restrict network access to MMS protocol endpoints and monitor for suspicious traffic.

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