The CVE-2025-66478 entry was reserved on December 2, 2025, but later marked as 'REJECTED' by the assigner 'GitHub_M'. No technical details, affected software versions, or vulnerability descriptions are provided. The lack of a CVSS score and absence of known exploits in the wild further confirm that this CVE does not describe a legitimate security vulnerability. The rejection status typically means the CVE was either a duplicate, invalid, or otherwise not meeting the criteria for a valid vulnerability record. Consequently, there is no technical information to analyze or remediate.

Since CVE-2025-66478 is a rejected and invalid CVE entry with no associated vulnerability, there is no impact on confidentiality, integrity, or availability. No systems or organizations, including those in Europe, are affected. No exploitation or attack vectors exist for this non-threat.

No mitigation actions are necessary because CVE-2025-66478 does not represent a real vulnerability. Security teams should verify their vulnerability management databases to ensure this CVE is not mistakenly treated as a valid threat. Maintaining up-to-date vulnerability feeds and cross-checking CVE statuses can prevent unnecessary response efforts.