CVE-2026-56758

MEDIUM 6.5

MZ Automation libiec61850 Out-of-bounds Read

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-125
Vendor	mz automation gmbh
Product	libiec61850
Published	Jul 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

MZ Automation GmbH / libiec61850

0 < 1.6.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

cisa.gov: https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10 github.com: https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.json

Credits

Arun Babu of Central Power Research Institute reported this vulnerability to CISA.