Quick answers
- Is CVE-2026-50103 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-50103 being exploited in the wild.
- How severe is CVE-2026-50103?
- Medium severity, with a CVSS score of 6.5, published 23 July 2026.
- Which products and versions are affected?
- MZ Automation libIEC61850 >=v1.0.0, <=v1.6.1.
- Is there a fix for CVE-2026-50103?
- 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-2026-50103 attacked?
- It is attacked from the adjacent network, in a software library.
- Am I affected by CVE-2026-50103?
- 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
The vulnerability is a NULL pointer dereference (CWE-228/CWE-476) within the shared parser for Layer 2 GOOSE and Routable GOOSE (R-GOOSE) protocols in libIEC61850. The flaw is triggered when the parser encounters a malformed Type-Length-Value (TLV) structure in a crafted GOOSE frame. An unauthenticated attacker located on the same network segment (adjacent) can exploit this to cause a denial-of-service (DoS) condition by crashing the subscribing application. 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.
Affected products
- MZ Automation libIEC61850 >=v1.0.0, <=v1.6.1
Timeline
- 2026-07-23: disclosed
- 2026-07-23: advisory