---
id: CVE-2026-73456
title: >-
  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 a…
summary: >-
  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 a…
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-94
vendor: Arista Networks
product: EOS
affected:
  - EOS >= 4.36.0 <= 4.36.1F
  - EOS >= 4.35.0 <= 4.35.5M
  - EOS >= 4.34.2F <= 4.34.7M
published: '2026-09-16'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T12:18:25.887'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73456'
references:
  - url: >-
      https://www.arista.com/en/support/advisories-notices/security-advisory/24714-security-advisory-0158
    label: psirt@arista.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-17T03:57:34.132493Z'
ingestedAt: '2026-09-16T19:02:30.722Z'
epss: 0.00695
epssPercentile: 0.50881
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.