Is CVE-2026-66360 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-66360 being exploited in the wild.

How severe is CVE-2026-66360?

High severity, with a CVSS score of 7.5, published 30 July 2026.

Which products and versions are affected?

MZ Automation GmbH libiec61850 < 1.6.2.

Is there a fix for CVE-2026-66360?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-66360 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-66360?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-66360: MZ Automation libiec61850 out-of-bounds read in ISO Presentation layer

Q: Is there a fix for CVE-2026-66360?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

Q: How is CVE-2026-66360 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-66360?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-66360 · Severity: high · CVSS 7.5 · Published 2026-07-30

A vulnerability exists in a specialized communication library used in energy and industrial automation systems. An attacker can send a specially crafted network request to a device using this library, causing the system to crash and become unavailable. This results in a denial-of-service condition that could disrupt critical infrastructure operations.

Quick answers

Is CVE-2026-66360 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-66360 being exploited in the wild.
How severe is CVE-2026-66360?: High severity, with a CVSS score of 7.5, published 30 July 2026.
Which products and versions are affected?: MZ Automation GmbH libiec61850 < 1.6.2.
Is there a fix for CVE-2026-66360?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-66360 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-66360?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An out-of-bounds read vulnerability (CWE-125) exists in the ISO Presentation layer of libiec61850 due to a missing length check during normal mode negotiation. Specifically, the processing of encoded presentation data fails to validate attacker-controlled fields, where a zero-length value triggers a bounded heap over-read. This flaw can be exploited remotely via a crafted TCP port 102 connection attempt before an MMS session is even established. Successful exploitation causes the process to terminate, resulting in a denial-of-service (DoS) condition. The issue is resolved in version 1.6.2.

Affected products

MZ Automation GmbH libiec61850 < 1.6.2

Timeline

2026-07-30: advisory: CISA ICSA-26-211-10 published
2026-07-30: disclosed: CVE-2026-66360 published in NVD

References

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