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.

Severity: critical (CVSS 10.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-16 · updated 2026-09-17
Weakness: CWE-94

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

Arista Networks EOS: from 4.36.0 through 4.36.1F; from 4.35.0 through 4.35.5M; from 4.34.2F through 4.34.7M

References

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

Get alerted when CVE-2026-73456 or the next vulnerability affects your stack