CVE-2026-73456 — Under certain circumstances, an unauthenticated gNPSI client can craft a malicious request to allow arbitrary code execution, granting an attacker full administrative control over the compromised switch.

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CRITICAL

Under certain circumstances, an unauthenticated gNPSI client can craft a malicious request to allow arbitrary code execution, granting an attacker full administrative control over the compromised switch.

Published Sep 16, 2026

9.2

CRITICAL

CVSS 4.0

EPSS 0.69%

Description

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

Vendor Arista Networks Product EOS Default
unaffected
- Version
  4.34.2F
  Status
  affected
  Constraints
  <=4.34.7M
- Version
  4.35.0
  Status
  affected
  Constraints
  <=4.35.5M
- Version
  4.36.0
  Status
  affected
  Constraints
  <=4.36.1F

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Arista Networks

EOS

unaffected

Version	Status	Constraints
4.34.2F	affected	<=4.34.7M
4.35.0	affected	<=4.35.5M
4.36.0	affected	<=4.36.1F

Remediation

Vendor solution

The recommended resolution is to upgrade to a remediated software version at your earliest convenience. CVE-2026-73456 has been fixed in the following releases:

* 4.36.2F and later releases in the 4.36.x train * 4.35.6M and later releases in the 4.35.x train * 4.34.8M and later releases in the 4.34.x train