What is CVE-2026-73456?

CVE-2026-73456 is a critical-severity vulnerability in Arista Networks Eos, classified under Code Injection. CVSS score: 10.0/10. Published 2026-09-16.

How severe is CVE-2026-73456?

Critical severity. CVSS v3 base score is 10.0 out of 10.

RCE in Arista Networks Eos

CVE-2026-73456

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.

Vulnerability class: RCE (Remote Code Execution)

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Arista Networks Eos

Weakness classification (CWE)

CWE-94 — Code Injection

References

psirt@arista.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-73456?: CVE-2026-73456 is a critical-severity vulnerability in Arista Networks Eos, classified under Code Injection. CVSS score: 10.0/10. Published 2026-09-16.
How severe is CVE-2026-73456?: Critical severity. CVSS v3 base score is 10.0 out of 10.