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.

State: Published
Severity: 9.2 Critical
Published: Sep 16, 2026
Updated: Sep 17, 2026
Reserved: Aug 12, 2026

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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.

Scores

CVSS	Score	Vector	Source
4.0	9.2 Critical	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	Arista
3.1	10.0 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H	Arista

Weaknesses

CWE-94 Improper Control of Generation of Code ('Code Injection')

Affected Products

Product	Versions
EOSArista Networks	4.36.0 through 4.36.1FAffectedfrom 4.36.2FNot affected 4.35.0 through 4.35.5MAffectedfrom 4.35.6MNot affected 4.34.2F through 4.34.7MAffectedfrom 4.34.8MNot affected

References

https://www.arista.com/en/support/advisories-notices/security-advisory/24714-security-advisory-0158vendor-advisory

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