Vulnerability Description
The GOOSE parser contains an off-by-one boundary-handling flaw that can be triggered by a single unauthenticated Layer-2 multicast frame on the process bus. When specific GOOSE message fields are processed, the parser advances its internal buffer position incorrectly, resulting in a heap out-of-bounds read. On affected platforms, this condition reliably terminates the subscriber process and causes a denial-of-service.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-21
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10
FAQ
What is CVE-2026-66369?
CVE-2026-66369 is a vulnerability with a CVSS score of 6.5 (MEDIUM). The GOOSE parser contains an off-by-one boundary-handling flaw that can be triggered by a single unauthenticated Layer-2 multicast frame on the process bus. When specific GOOSE message fields are pr...
How severe is CVE-2026-66369?
CVE-2026-66369 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-66369?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.