CVE-2026-73456: Arista Networks Eos

Critical severity, CVSS 10.0. EPSS: 0.7% chance of exploitation in the next 30 days.

Under certain circumstances on affected platforms running Arista EOS with gRPC Network Packet Sampling Interface (gNPSI) enabled, an unauthenticated gNPSI client can craft a malicious request to allow arbitrary code execution, granting an attacker full administrative control over the compromised switch.

Affected products

• Arista Networks Eos: from 4.36.0, up to and including 4.36.1F; from 4.35.0, up to and including 4.35.5M; from 4.34.2F, up to and including 4.34.7M

Published 2026-09-16. Last modified 2026-09-17.