CVE-2026-50103 PUBLISHED

Improper Handling of Syntactically Invalid Structure in MZ Automation libIEC61850

Assigner: icscert
Reserved: 09.06.2026 Published: 23.07.2026 Updated: 24.07.2026

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.

CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 6.5

Attack Vector	Adjacent Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 7.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	MZ Automation
Product	libIEC61850
Versions	Default: unaffected affected from 1.0.0 to 1.6.1 (incl.)

Solutions

MZ Automation recommends updating to the latest build of the libIEC61850 standard. Documentation can be found at https://github.com/mz-automation/libiec61850. https://github.com/mz-automation/libiec61850

Credits

Abhinav Agarwal reported this vulnerability to CISA finder

References

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

Problem Types

CWE-228 Improper Handling of Syntactically Invalid Structure CWE