CVE-2026-19640: Arista Networks Eos

Medium severity, CVSS 4.2. EPSS: 0.2% chance of exploitation in the next 30 days.

On affected platforms running Arista EOS, an authenticated user with access to the gNMI (gRPC Network Management Interface) may receive incorrect authorization results, potentially allowing access beyond their currently assigned permissions. This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.

Affected products

• Arista Networks Eos: from 4.36.0F, up to and including 4.36.0.1F; from 4.35.0F, up to and including 4.35.5M; from 4.34.0F, up to and including 4.34.7M; from 4.33.0F, up to and including 4.33.8M; from 4.24.0F, before 4.33.0F (fixed in 4.33.0F)

Published 2026-09-16. Last modified 2026-09-16.