What is GHSA-r4hv-9qm7-gp9j?

GHSA-r4hv-9qm7-gp9j is a security advisory published by GitHub Security Advisories with High severity. The GOOSE subscriber component improperly validates the UTC timestamp field in unauthenticated...

Which CVE IDs does GHSA-r4hv-9qm7-gp9j cover?

GHSA-r4hv-9qm7-gp9j covers the following CVE IDs: CVE-2026-66720. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-r4hv-9qm7-gp9j?

GHSA-r4hv-9qm7-gp9j has a CVSS v3 base score of 6.5, published by GitHub Security Advisories.

GHSA-r4hv-9qm7-gp9jHighCVSS 6.5

The GOOSE subscriber component improperly validates the UTC timestamp field in unauthenticated...

Vendor

GitHub Security Advisories

Published

July 31, 2026

Last Modified

July 31, 2026

🔗 CVE IDs covered (1)

CVE-2026-66720 →

📋 Description

The GOOSE subscriber component improperly validates the UTC timestamp field in unauthenticated IEC 61850 GOOSE (EtherType 0x88B8) Layer-2 multicast messages. A specially crafted GOOSE frame containing an undersized timestamp field can trigger a heap out-of-bounds read during message processing, causing the process to crash and resulting in a denial-of-service condition.

🔗 References (4)

https://nvd.nist.gov/vuln/detail/CVE-2026-66720
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.json
https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10
https://github.com/advisories/GHSA-r4hv-9qm7-gp9j