CVE-2026-50103 Improper Handling of Syntactically Invalid Structure in MZ Automation libIEC61850
A network-adjacent attacker can crash a subscribing application by sending a crafted GOOSE frame with a malformed TLV value.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-50103?
CVE-2026-50103 is a high-severity vulnerability in MZ Automation libIEC61850, published on 23 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A NULL pointer dereference in the L2 GOOSE and R-GOOSE shared parser, which may allow a network-adjacent attacker to crash a subscribing application by sending a crafted GOOSE frame containing a malformed TLV value.
Weakness: CWE-228
Which versions are affected by CVE-2026-50103?
How do I fix CVE-2026-50103?
No fix has been published for CVE-2026-50103 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-50103 being exploited?
There is no known exploitation of CVE-2026-50103 in the wild and no public exploit code.
Sources
Also known as GHSA-mg79-w9qx-hwj2.