Medium severity · published Jul 23, 2026
CVE-2026-50103
Improper Handling of Syntactically Invalid Structure in MZ Automation libIEC61850
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libIEC61850 · MZ Automation
1.0.0 through 1.6.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-50103
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-50103
www.cisa.gov
https://www.cisa.gov/news-events/ics-advisories/icsa-26-204-06
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