CVE-2026-19640 Security Advisory 0170
Authenticated users on Arista EOS may bypass gNMI authorization checks to access resources beyond their assigned permissions.
- 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-2026-19640?
CVE-2026-19640 is a low-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, an authenticated user with access to the gNMI (gRPC Network Management Interface) may receive incorrect authorization results, potentially allowing access beyond their currently assigned permissions.
This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.
Weakness: CWE-863
Which versions are affected by CVE-2026-19640?
How do I fix CVE-2026-19640?
No fix has been published for CVE-2026-19640 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-2026-19640 being exploited?
There is no known exploitation of CVE-2026-19640 in the wild and no public exploit code.
Sources
Also known as GHSA-9rwj-hhp6-m2cg.