CVE-2026-73456 Code injection in EOS
Unauthenticated attackers can execute arbitrary code on Arista EOS switches with gNPSI enabled, gaining full administrative control.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73456?
CVE-2026-73456 is a critical code injection vulnerability in Arista Networks EOS, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-94
Which versions are affected by CVE-2026-73456?
How do I fix CVE-2026-73456?
No fix has been published for CVE-2026-73456 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-73456 being exploited?
There is no known exploitation of CVE-2026-73456 in the wild and no public exploit code.
Sources
Also known as GHSA-7g93-8r7h-w6jj.