# CVE-2026-50032: MZ Automation libIEC61850 NULL pointer dereference in MMS handler

Source: https://junglewise.ai/threats/cve-2026-50032-mz-automation-libiec61850-null-pointer-dereference-in-mms-handler  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-23. Updated: 2026-07-23  
License: CC BY 4.0 with a link back

CVE-2026-50032 · Severity: high · CVSS 7.5 · Published 2026-07-23

MZ Automation libIEC61850 is a software library used in industrial control systems to implement communication protocols for power grid automation and energy infrastructure. A vulnerability in how the library handles specific data requests could allow an attacker to crash the server, leading to a loss of visibility and control over critical industrial processes. This disruption could impact operations in sectors such as energy, manufacturing, and transportation.

Technologies: [MZ Automation libIEC61850](https://junglewise.ai/threats/technologies/libiec61850). Vendors: [MZ Automation](https://junglewise.ai/threats/vendors/mz-automation).

## Quick answers

**Is CVE-2026-50032 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-50032 being exploited in the wild.

**How severe is CVE-2026-50032?** High severity, with a CVSS score of 7.5, published 23 July 2026.

**Which products and versions are affected?** MZ Automation libIEC61850 >=1.0.0, <=1.6.1.

**Is there a fix for CVE-2026-50032?** 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-2026-50032 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-50032?** Check whether you run MZ Automation libIEC61850 at an affected version. 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 NULL pointer dereference (CWE-476) exists in the Manufacturing Message Specification (MMS) Write Named Variable List handler of libIEC61850. The vulnerability is triggered when the server receives a 'WriteRequest' containing an empty 'listOfData' field. An unauthenticated, network-adjacent or remote attacker (depending on network configuration) can exploit this to cause a crash of the service, resulting in a denial-of-service (DoS). The issue affects versions 1.0.0 through 1.6.1. Users are advised to update to the latest build from the vendor's repository to remediate the flaw.

## Affected products

- MZ Automation libIEC61850 >=1.0.0, <=1.6.1

## Timeline

- 2026-07-23: disclosed
- 2026-07-23: advisory: Initial publication by CISA (ICSA-26-204-06)

## References

- [https://www.cisa.gov/news-events/ics-advisories/icsa-26-204-06](https://www.cisa.gov/news-events/ics-advisories/icsa-26-204-06)

## Related threats

- [libIEC61850 invalid free in MMS report serialization](https://junglewise.ai/threats/cve-2026-68908-libiec61850-is-an-open-source-implementation-of-iec-61850-client)
- [libIEC61850 buffer over-read in dataset access handler](https://junglewise.ai/threats/cve-2026-68907-libiec61850-is-an-open-source-implementation-of-iec-61850-client)
- [libIEC61850 infinite loop in ACSE parseUserInformation](https://junglewise.ai/threats/cve-2026-68906-libiec61850-is-an-open-source-implementation-of-iec-61850-client)
- [libIEC61850 MMS ObtainFile double-free denial of service](https://junglewise.ai/threats/cve-2026-57446-libiec61850-is-an-open-source-implementation-of-iec-61850-client)
- [libIEC61850 NULL pointer dereference in MMS read service](https://junglewise.ai/threats/cve-2026-48741-libiec61850-is-an-open-source-implementation-of-iec-61850-client)