CVE-2026-73439 Security Advisory 0164
Authenticated users may bypass gNSI Pathz restrictions to read or write gNMI paths when specific group and user rules conflict.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73439?
CVE-2026-73439 is a high-severity missing authorization vulnerability in Arista Networks EOS, published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
On affected platforms running Arista EOS, if OpenConfig is configured and running a gNMI server on the system, and if gNSI Pathz is configured and a gNSI Pathz policy is present on the system, then gNMI may fail to correctly enforce the rules in this policy if both a group rule and a user rule for the same path is present in the policy. Under certain conditions, this can lead to an authenticated user gaining unauthorized permission to read or write gNMI paths that the Pathz policy is intended to restrict.
Weakness: CWE-842
Which versions are affected by CVE-2026-73439?
How do I fix CVE-2026-73439?
No fix has been published for CVE-2026-73439 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-73439 being exploited?
There is no known exploitation of CVE-2026-73439 in the wild and no public exploit code.
Sources
Also known as GHSA-hhmm-qmjm-g2hp.