Is CVE-2026-63550 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-63550 being exploited in the wild.

How severe is CVE-2026-63550?

Medium severity, with a CVSS score of 6.5, published 30 July 2026.

Which products and versions are affected?

MZ Automation GmbH libiec61850 < 1.6.2.

Is there a fix for CVE-2026-63550?

A patch was published on 2026-07-30: Vendor recommends updating to version 1.6.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-63550 attacked?

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

Am I affected by CVE-2026-63550?

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-2026-63550: MZ Automation GmbH libiec61850 heap out-of-bounds read in MMS BER decoder

Q: Is there a fix for CVE-2026-63550?

A patch was published on 2026-07-30: Vendor recommends updating to version 1.6.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-63550 attacked?

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

Q: Am I affected by CVE-2026-63550?

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-2026-63550 · Severity: medium · CVSS 6.5 · Published 2026-07-30

A vulnerability exists in a library used for communication in energy and industrial control systems. An attacker with access to the network could send a specially crafted message to a device using this library, causing the communication service to crash. This results in a denial-of-service, potentially disrupting the monitoring or control of critical infrastructure.

Quick answers

Is CVE-2026-63550 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-63550 being exploited in the wild.
How severe is CVE-2026-63550?: Medium severity, with a CVSS score of 6.5, published 30 July 2026.
Which products and versions are affected?: MZ Automation GmbH libiec61850 < 1.6.2.
Is there a fix for CVE-2026-63550?: A patch was published on 2026-07-30: Vendor recommends updating to version 1.6.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-63550 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-63550?: 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

A heap out-of-bounds read vulnerability (CWE-125) exists in the MMS BER decoder of libiec61850. The flaw is located in the boundary-handling logic when processing specific fields within confirmed-request messages. An attacker can exploit this by sending a crafted BER-encoded element over an established MMS session (TCP port 102). This causes the decoder to incorrectly advance its internal read position, leading to an out-of-bounds read that crashes the MMS handling process. The vulnerability is addressed 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-2026-63550 published
2026-07-30: patched: Vendor recommends updating to version 1.6.2

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.